Mathieu Desnoyers [Wed, 22 Jun 2016 15:34:26 +0000 (11:34 -0400)]
Fix: syscall-compat.h MacOSX support
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Michael Jeanson [Tue, 21 Jun 2016 20:52:52 +0000 (16:52 -0400)]
Fix: Add solaris-build.md to dist
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Fri, 10 Jun 2016 18:43:40 +0000 (14:43 -0400)]
rculfhash: Documentation: clarify need for grace period before "re-using"
Grace period must be waited for in case a node removed from the hash
table is re-used, similarly to the reclaim use-case.
Reported-by: Luke K D'Alessandro <ldalessa@indiana.edu>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Sebastien Boisvert [Thu, 2 Jun 2016 03:02:31 +0000 (23:02 -0400)]
Port: build shared libraries in Cygwin
Link: https://lists.lttng.org/pipermail/lttng-dev/2016-May/026081.html
Signed-off-by: Sebastien Boisvert <sboisvert@gydle.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Sebastien Boisvert [Thu, 2 Jun 2016 03:01:37 +0000 (23:01 -0400)]
Port: fix compatibility header for Cygwin
Signed-off-by: Sebastien Boisvert <sboisvert@gydle.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Michael Jeanson [Mon, 30 May 2016 19:58:03 +0000 (15:58 -0400)]
Add GNU Hurd support to syscall-compat.h
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Thu, 19 May 2016 20:08:50 +0000 (16:08 -0400)]
Add support for aarch64_be
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Wed, 18 May 2016 18:50:01 +0000 (14:50 -0400)]
Fix: urcu-bp: re-initialize list head on library exit
In case an application would try to create threads after the urcu-bp
library destructor has run, make sure the arena chunk list is
re-initialized after the memory mappings are unmapped.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Thu, 12 May 2016 15:54:46 +0000 (11:54 -0400)]
bootstrap: Standardize on autoreconf -vi
Don't overwrite already generated files.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Michael Jeanson [Thu, 12 May 2016 15:05:40 +0000 (11:05 -0400)]
Harmonize bootstrap script across projects
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Tue, 10 May 2016 22:22:00 +0000 (18:22 -0400)]
Fix: examples make distcheck failure
"make distcheck" marks each source file on the srcdir in the extracted
dist tarball read-only. The examples copy from the srcdir into the
builddir before running the "make" examples, but this keeps the
read-only flag on the builddir directories, which fails the build
because the resulting objects cannot be created.
Fix this by ensuring the copied target directory for each example is
user-writeable.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Tue, 8 Mar 2016 00:24:20 +0000 (19:24 -0500)]
wfcqueue: add C++ compatibility API
Introduce __cds_wfcq_head_cast and cds_wfcq_head_cast for compability
of wfcqueue with c++. Those are effect-less in C, where transparent
unions are supported. However, in C++, those transform struct
cds_wfcq_head and struct __cds_wfcq_head pointers to
cds_wfcq_head_ptr_t.
Reviewed-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Tested-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Sat, 5 Mar 2016 15:09:33 +0000 (10:09 -0500)]
Fix: CDS_WFCQ_WOULDBLOCK typing for c++
Reviewed-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Tested-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Olof Johansson [Wed, 10 Feb 2016 09:39:50 +0000 (10:39 +0100)]
Fix: configure.ac: check for possibly required libs for clock_gettime
On some platforms, you have to link with rt to get clock_gettime. This
solves errors like:
undefined reference to `clock_gettime'
Fixes: #996
Signed-off-by: Olof Johansson <olof.johansson@axis.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Marek Vasut [Tue, 9 Feb 2016 18:30:22 +0000 (19:30 +0100)]
Support for NIOS2 architecture
Add support for the Altera NIOS2 CPU archirecture. The atomic operations
are handled by the GCC. The memory barriers on this systems are entirely
trivial too, since the CPU does not support SMP at all.
Signed-off-by: Marek Vasut <marex@denx.de>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Thu, 21 Jan 2016 16:45:58 +0000 (11:45 -0500)]
urcu_ref_get_safe: introduce new API
Add a urcu_ref_get_safe API, which returns a boolean. It takes the value
"false" if a LONG_MAX overflow would occur (get is not performed in this
case), or true otherwise.
It warns the user (at compile-time) if the return value is unchecked.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Tue, 19 Jan 2016 20:23:01 +0000 (15:23 -0500)]
Fix: handle reference count overflow
The urcu refcounting API features a look and feel similar to the Linux
kernel reference counting API, which has been the subject of
CVE-2016-0728 (use-after-free). Therefore, improve the urcu refcounting
API by dealing with reference counting overflow.
For urcu_ref_get(), handle this by comparing the prior value with
LONG_MAX before updating it with a cmpxchg. When an overflow would
occur, trigger a abort() rather than allowing the overflow (which is a
use-after-free security concern).
For urcu_ref_get_unless_zero(), in addition to compare the prior value
to 0, also compare it to LONG_MAX, and return failure (false) in both
cases.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Fri, 4 Dec 2015 07:03:02 +0000 (08:03 +0100)]
Fix: compat_futex should work-around futex signal-restart kernel bug
When testing liburcu on a 3.18 Linux kernel, 2-core MIPS (cpu model :
Ingenic JZRISC V4.15 FPU V0.0), we notice that a blocked sys_futex
FUTEX_WAIT returns -1, errno=ENOSYS when interrupted by a SA_RESTART
signal handler. This spurious ENOSYS behavior causes hangs in liburcu
0.9.x. Running a MIPS 3.18 kernel under a QEMU emulator exhibits the
same behavior. This might affect earlier kernels.
This issue appears to be fixed in 3.19 since commit
e967ef022 "MIPS: Fix
restart of indirect syscalls", but nevertheless, we should try to handle
this kernel bug more gracefully than a user-space hang due to unexpected
spurious ENOSYS return value.
Therefore, fallback on the "async-safe" version of compat_futex in those
situations where FUTEX_WAIT returns ENOSYS. This async-safe fallback has
the nice property of being OK to use concurrently with other FUTEX_WAKE
and FUTEX_WAIT futex() calls, because it's simply a busy-wait scheme.
The 4.2 kernel on parisc, and likely newer kernels too, are also
affected by a similar issue.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
CC: Michael Jeanson <mjeanson@efficios.com>
CC: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
CC: Ralf Baechle <ralf@linux-mips.org>
CC: linux-mips@linux-mips.org
CC: linux-kernel@vger.kernel.org
CC: "James E.J. Bottomley" <jejb@parisc-linux.org>
CC: Helge Deller <deller@gmx.de>
CC: linux-parisc@vger.kernel.org
Didier Nadeau [Wed, 16 Dec 2015 20:02:47 +0000 (15:02 -0500)]
Support for Xeon-Phi with newer MPSS
The Xeon-Phi is now considered as a new architecture instead of a
vendor in MPSS version 3.4.4. This change is backward compatible with
previous MPSS versions.
Signed-off-by: Didier Nadeau <didier.nadeau@gmail.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Mon, 16 Nov 2015 16:33:55 +0000 (11:33 -0500)]
sparc64: allocate membarrier system call number
Now that the membarrier system call is allocated on sparc, allocate
its number in our architecture header if the system headers don't
allocate it. This allows using the membarrier system call as soon as
implemented in the kernel, even if the distribution has old kernel
headers.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Mon, 16 Nov 2015 16:31:10 +0000 (11:31 -0500)]
hppa: allocate membarrier system call number
Now that the membarrier system call is allocated on hppa (parisc),
allocate its number in our architecture header if the system headers
don't allocate it. This allows using the membarrier system call as soon
as implemented in the kernel, even if the distribution has old kernel
headers.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Michael Jeanson [Thu, 12 Nov 2015 16:27:47 +0000 (11:27 -0500)]
Fix build on non-Linux Debian ports
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Fri, 30 Oct 2015 21:11:55 +0000 (17:11 -0400)]
Fix: urcu-signal: smp_mb_master() needs registry lock
The signal-based urcu flavor calls smp_mb_master() within the wait_gp()
function. Since commit "Fix: deadlock when thread join is issued in
read-side C.S.", wait_gp() is called without the registry lock held.
Ensure that the registry lock is only released around the wait per se,
not around the call to smp_mb_master(), otherwise we end up iterating on
a non-consistent thread registry in smp_mb_master().
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Wed, 28 Oct 2015 19:57:22 +0000 (15:57 -0400)]
Fix: rculfhash only needs to include urcu-pointers.h
rculfhash is not meant to use a specific urcu flavor, but rather receive
the flavor to use as parameter to _cds_lfht_new().
All we need is the API of urcu-pointers.h, so include that instead.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Fri, 16 Oct 2015 23:09:00 +0000 (19:09 -0400)]
Fix: out-of-tree benchmark/regtest
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Fri, 16 Oct 2015 21:53:49 +0000 (17:53 -0400)]
Fix: add missing regtest and benchmark files to dist tarball
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Fri, 16 Oct 2015 20:48:45 +0000 (16:48 -0400)]
Fix: add missing run.sh to benchmark makefile
This fixes make regtest on a distribution tarball.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Fri, 16 Oct 2015 19:31:56 +0000 (15:31 -0400)]
Version 0.9.0
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Fri, 16 Oct 2015 19:28:57 +0000 (15:28 -0400)]
Bump soname major to 4
The tls-compat.h header now emits different symbols, we therefore need
to bump the soname to 4:0:0.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Fri, 16 Oct 2015 19:24:15 +0000 (15:24 -0400)]
Cleanup: remove trailing tab
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Michael Jeanson [Thu, 8 Oct 2015 19:54:15 +0000 (15:54 -0400)]
Fix: Use proper macro to detect stdbool.h
Using AC_HEADER_STDBOOL make more sense since we don't use
gnulib and it works with older autoconf versions.
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Michael Jeanson [Wed, 7 Oct 2015 18:43:49 +0000 (14:43 -0400)]
Configure: Add missing checks
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Michael Jeanson [Tue, 6 Oct 2015 11:50:28 +0000 (07:50 -0400)]
Port: Add Solaris build instructions
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Michael Jeanson [Mon, 5 Oct 2015 21:41:59 +0000 (17:41 -0400)]
Fix: regtest outputs valid TAP protocol
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Michael Jeanson [Mon, 5 Oct 2015 19:03:34 +0000 (15:03 -0400)]
Port: Detect nproc bin name in benchmark scripts
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Michael Jeanson [Fri, 2 Oct 2015 19:37:55 +0000 (15:37 -0400)]
Port: Add Solaris getcpu support
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Michael Jeanson [Fri, 2 Oct 2015 19:43:16 +0000 (15:43 -0400)]
Port: Fixes to build system for portability
Move our own m4 scripts to m4/. Scripts in this directory are
automatically included.
Make nproc command configurable.
Make grep command configurable.
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Michael Jeanson [Tue, 29 Sep 2015 10:38:08 +0000 (06:38 -0400)]
Port: Add Solaris support to tests/common/thread-id.h
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Michael Jeanson [Tue, 29 Sep 2015 10:37:48 +0000 (06:37 -0400)]
Port: Add Solaris support to urcu/syscall-compat.h
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Michael Jeanson [Tue, 29 Sep 2015 10:02:14 +0000 (06:02 -0400)]
Port: replace bzero() by memset()
bzero() was deprecated in POSIX 2001 and removed from POSIX 2008,
while memset() is part of the C standard.
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Michael Jeanson [Fri, 2 Oct 2015 15:01:52 +0000 (11:01 -0400)]
Port: make bootstrap script work on most shell
The "-e" switch, which tests if a file or directory exists, is not
implemented in all shells. Use "-d" instead which is more widely
available.
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Thu, 1 Oct 2015 19:01:14 +0000 (15:01 -0400)]
tests: rcutorture: use parameters rather than random
Ensure those tests are reproducible by passing the kind of callrcu
worker as parameter to the test rather than randomly choosing it within
the test.
Expand the regression_tests list to invoke the test with all kinds of
callrcu workers.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Tue, 29 Sep 2015 15:56:28 +0000 (11:56 -0400)]
Fix: only define membarrier system call on Linux
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Mon, 28 Sep 2015 23:27:02 +0000 (19:27 -0400)]
Refactor tests
- Migrate benchmarks and regression tests to tap,
- Replace the "bench" make target by "short_bench" and "long_bench".
The short benchmark is 3 seconds per test, and the long one is 30
seconds per test,
- make regtest now invokes the benchmarks with only 1 second per
benchmark.
- Now use "nproc" command to detect the number of available CPUs rather
than hardcoding a value.
- rcutorture in "stress" mode is now executed.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Mon, 28 Sep 2015 23:30:14 +0000 (19:30 -0400)]
Fix: cast caa_cycles_t to unsigned long long
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Mon, 28 Sep 2015 16:58:59 +0000 (12:58 -0400)]
caa_get_cycles: caa_ prefix for type, use CLOCK_MONOTONIC
clock_gettime() of CLOCK_MONOTONIC mimicks better the behavior of a
cycle counter, since it is not affected by NTP major time updates.
Also, now prefix "cycles_t" with a caa_ prefix, so it does not clash
with application namespaces. Anyway, caa_get_cycles() is mostly used in
testing.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Mon, 28 Sep 2015 15:50:51 +0000 (11:50 -0400)]
Cleanup: remove trailing whitespaces at EOL
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Mon, 28 Sep 2015 15:44:49 +0000 (11:44 -0400)]
Cleanup: move generic caa_get_cycles to arch/generic.h
Eliminate some code duplication. It also implements a "generic"
caa_get_cycles() on architectures where its support is not implemented.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Mon, 28 Sep 2015 15:36:55 +0000 (11:36 -0400)]
tile: allocate membarrier system call number
Now that the membarrier system call is allocated on tile, allocate
its number in our architecture header if the system headers don't
allocate it. This allows using the membarrier system call as soon as
implemented in the kernel, even if the distribution has old kernel
headers.
Do so by creating headers specifically for tile, which rely on the
gcc atomic and memory barrier builtins.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Mon, 28 Sep 2015 15:34:08 +0000 (11:34 -0400)]
ia64: allocate membarrier system call number
Now that the membarrier system call is allocated on ia64, allocate
its number in our architecture header if the system headers don't
allocate it. This allows using the membarrier system call as soon as
implemented in the kernel, even if the distribution has old kernel
headers.
Do so by creating headers specifically for ia64, which rely on the
gcc atomic and memory barrier builtins.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Mon, 28 Sep 2015 15:27:55 +0000 (11:27 -0400)]
aarch64: allocate membarrier system call number
Now that the membarrier system call is allocated on aarch64, allocate
its number in our architecture header if the system headers don't
allocate it. This allows using the membarrier system call as soon as
implemented in the kernel, even if the distribution has old kernel
headers.
Do so by creating headers specifically for aarch64, which rely on the
gcc atomic and memory barrier builtins.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Mon, 28 Sep 2015 15:16:57 +0000 (11:16 -0400)]
powerpc64le: use "ppc" architecture
powerpc64le has been originally added to urcu with the "gcc" generic
architecture support. After testing, it appears that the "ppc"
architecture works as well.
Move to the "ppc" architecture so it becomes the same as other powerpc
32/64 (big endian) architectures.
Doing so wires up the membarrier system call on powerpc64le.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Mon, 28 Sep 2015 14:46:54 +0000 (10:46 -0400)]
arm: allocate membarrier system call number
Now that the membarrier system call is allocated on ARM, allocate its
number in our architecture header if the system headers don't allocate
it. This allows using the membarrier system call as soon as implemented
in the kernel, even if the distribution has old kernel headers.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Sat, 26 Sep 2015 15:17:18 +0000 (11:17 -0400)]
s390: allocate membarrier system call number
Now that the membarrier system call is allocated on s390/s390x, allocate
its number in our architecture header if the system headers don't
allocate it. This allows using the membarrier system call as soon as
implemented in the kernel, even if the distribution has old kernel
headers.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Sat, 26 Sep 2015 15:15:02 +0000 (11:15 -0400)]
ppc: allocate membarrier system call number
Now that the membarrier system call is allocated on powerpc, allocate
its number in our architecture header if the system headers don't
allocate it. This allows using the membarrier system call as soon as
implemented in the kernel, even if the distribution has old kernel
headers.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Tue, 22 Sep 2015 16:15:02 +0000 (12:15 -0400)]
lfstack: relax constraints on node re-use
The documentation of the RCU-based synchronization technique in lfstack
is too strict. It currently states that the cds_lfs_node structure
cannot be overwritten before a grace period has passed. However, lfstack
pop only use the next pointer as the replacement value when doing the
cmpxchg on the head. After the node has been pop'd from the stack,
concurrent cmpxchg trying to pop that same node will necessarily fail as
long as there is a grace period before pop/pop_all and re-adding the
node into the stack.
It is therefore sufficient to wait for a grace period between:
1) pop/pop_all and
2) freeing the node (to ensure existence for concurrent pop trying to
read node->next) or re-adding the node into the stack.
This node re-use constraint relaxation is only possible because we don't
care about node->next content read by concurrent pop: it will be simply
discarded by the cmpxchg on head. Be careful not to apply this relaxed
constraint to other data structures which care about the content of the
node's next pointer (e.g. wfstack).
This relaxed constraint allows implementing efficient free-lists (memory
allocation) with a lock-free allocation/free based on lfstack: it allows
re-using the memory backing the free-list node immediately after
allocation. The only requirement with respect to this use-case is to
wait for a grace period before putting the node back into the free-list.
Also update the test_urcu_lfs to poison the next pointer immediately
after pop/pop_all to make sure we test this relaxed constraint.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
CC: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
CC: Lai Jiangshan <jiangshanlai@gmail.com>
CC: lttng-dev@lists.lttng.org
CC: rp@svcs.cs.pdx.edu
Mathieu Desnoyers [Mon, 21 Sep 2015 20:48:07 +0000 (16:48 -0400)]
Fix: format string signedness
Detected by cppcheck.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Mon, 21 Sep 2015 19:32:57 +0000 (15:32 -0400)]
Cleanup: tests: Branch condition evaluates to a garbage value
scan-build reported this:
Logic error Branch condition evaluates to a garbage value tests
/benchmark /test_urcu_hash_rw.c 170
Logic error Branch condition evaluates to a garbage value tests
/benchmark /test_urcu_hash_rw.c 274
It should never happen based on code review, but silence this warning by
initializing to NULL.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Mon, 21 Sep 2015 16:38:37 +0000 (12:38 -0400)]
Fix: test: unchecked return value
Fix Coverity issues:
CID
1021635 (#1 of 2): Unchecked return value (CHECKED_RETURN)7.
check_return: Calling pthread_mutex_unlock without checking return value
(as is done elsewhere 29 out of 33 times).
CID
1021634 (#2 of 2): Unchecked return value (CHECKED_RETURN)12.
check_return: Calling pthread_mutex_unlock without checking return value
(as is done elsewhere 29 out of 33 times).
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Mon, 21 Sep 2015 15:55:17 +0000 (11:55 -0400)]
Fix: test: side-effect in assertion
Coverity detected:
CID
1021642 (#1 of 2): Side effect in assertion
(ASSERT_SIDE_EFFECT)assert_side_effect: Argument test_array of assert()
has a side effect because the variable is volatile. The containing
function might work differently in a non-debug build.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Fri, 18 Sep 2015 21:53:11 +0000 (17:53 -0400)]
x86: allocate membarrier system call number
Now that the membarrier system call is allocated on x86 32/64, allocate
its number in our architecture header if the system headers don't
allocate it. This allows using the membarrier system call as soon as
implemented in the kernel, even if the distribution has old kernel
headers.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Fri, 18 Sep 2015 20:34:53 +0000 (16:34 -0400)]
urcu-bp: use sys_membarrier when available
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Fri, 18 Sep 2015 20:33:29 +0000 (16:33 -0400)]
Cleanup: urcu: remove unused membarrier "group" parameter
Was planned in the 2010 implementation, but has never been used, and is
not needed with the current kernel membarrier implementation.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Thu, 17 Sep 2015 16:21:05 +0000 (12:21 -0400)]
urcu/ref.h: implement urcu_ref_get_unless_zero()
Allows getting a reference atomically if the reference count is not
zero. Returns true if the reference is taken, false otherwise. This
needs to be used in conjunction with another synchronization technique
(e.g. RCU or mutex) to ensure existence of the reference count.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Tue, 15 Sep 2015 05:50:38 +0000 (01:50 -0400)]
Fix: compat_futex: uninitialized ret variable
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Mon, 14 Sep 2015 00:47:10 +0000 (20:47 -0400)]
Fix: compat_futex_noasync: don't override return value
Fix error reported by Coverity:
** CID
1324336: Code maintainability issues (UNUSED_VALUE)
/compat_futex.c: 99 in compat_futex_noasync()
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Fri, 11 Sep 2015 14:33:43 +0000 (10:33 -0400)]
Fix: dynamic fallback to compat futex on sys_futex ENOSYS
Some MIPS processors (e.g. Cavium Octeon II) dynamically check if the
CPU supports ll/sc within sys_futex, and return a ENOSYS errno if they
don't, even though the architecture implements sys_futex.
Handle this situation by always building the sys_futex compatibility
layer, and fall-back on it if sys_futex return a ENOSYS errno. This is
a tiny compat layer which adds very little space overhead.
This adds an unlikely branch on return from sys_futex, which should
not be an issue performance-wise (we've already taken a system call).
Since this is a fall-back mode, don't try to be clever, and don't cache
the result, so that the common cases (architectures with a properly
working sys_futex) don't get two conditional branches, just one.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
CC: Michael Jeanson <mjeanson@efficios.com>
CC: Jon Bernard <jbernard@debian.org>
Mathieu Desnoyers [Sun, 13 Sep 2015 15:46:04 +0000 (11:46 -0400)]
Detect RCU read-side overflows
Use the urcu_assert() macro (enabled on DEBUG_RCU) to check for
unmatched rcu_read_lock() that eventually leads to nesting counter
overflow in urcu.h and urcu-bp.h. This won't necessarily point the the
exact rcu_read_lock() that is unmatched, but will at least detect the
overflow condition.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Sun, 13 Sep 2015 15:11:39 +0000 (11:11 -0400)]
Detect RCU read-side underflows
Use the urcu_assert() macro (enabled on DEBUG_RCU) to check for
unmatched rcu_read_unlock() that leads to nesting counter underflow in
urcu.h and urcu-bp.h.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Sun, 13 Sep 2015 14:48:03 +0000 (10:48 -0400)]
Introduce urcu_assert and registration check
Add a "registered" flag to urcu.c and urcu-qsbr.c, set/cleared when a
thread is registered and unregistered. Add corresponding asserts in
those functions checking if a thread is registered or unregistered more
than once (which would be a bug in the way the application uses urcu).
Move the checks enabled on RCU_DEBUG to a single header: urcu/debug.h.
Add checks for the registered flag in RCU read-side lock functions (new
urcu_assert() checks, which are only built-in if RCU_DEBUG is defined at
compile-time).
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Fri, 4 Sep 2015 05:09:39 +0000 (01:09 -0400)]
Fix: volatile in assert()
From Coverity:
CID
1021642 (#1 of 3): Side effect in assertion
(ASSERT_SIDE_EFFECT)assert_side_effect: Argument test_array of assert()
has a side effect because the variable is volatile. The containing
function might work differently in a non-debug build.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Sat, 29 Aug 2015 03:15:33 +0000 (23:15 -0400)]
Update following changes to sys_membarrier ABI
sys_membarrier underwent changes between its original implementation and
its upcoming inclusion into the Linux kernel. Update its use to follow
those changes.
Should the prior user-space code be built against a kernel header that
defines SYS_membarrier, and executed against that kernel, the following
scenarios may happen:
- -1 will be returned with EINVAL errno if the 2nd argument (flags) is
non-zero (the previous ABI expected a single argument),
- (MEMBARRIER_EXPEDITED | MEMBARRIER_QUERY) defined as
(1 << 0) | (1 << 16) will return -1 with EINVAL errno, because valid
commands are now one-hot.
Therefore, should an incompatible user-space code try to use
sys_membarrier, it will simply think that the system does not have
membarrier support due to the negative return value upon query.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Khem Raj [Sun, 23 Aug 2015 04:38:30 +0000 (21:38 -0700)]
uatomic: Specify complete types for atomic function calls
This was unearthed by clang compiler where it complained about parameter
mismatch, gcc doesnt notice this
urcu/uatomic/generic.h:190:10: error: address argument to atomic builtin
must be a pointer to integer or pointer ('void *' invalid)
return __sync_add_and_fetch_4(addr, val);
Fixed all instances thusly.
[ Edit by Mathieu: use stdint.h types. ]
Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Wed, 29 Jul 2015 19:11:17 +0000 (15:11 -0400)]
Cleanup: remove unused return value warning from tests
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Mon, 6 Jul 2015 20:32:28 +0000 (16:32 -0400)]
Fix: handle sys_futex() FUTEX_WAIT interrupted by signal
We need to handle EINTR returned by sys_futex() FUTEX_WAIT, otherwise a
signal interrupting this system call could make sys_futex return too
early, and therefore cause a synchronization issue.
Ensure that the futex compatibility layer returns meaningful errors and
errno when using poll() or pthread cond variables.
Reported-by: Gerd Gerats <geg@ngncc.de>
CC: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
CC: Lai Jiangshan <laijs@cn.fujitsu.com>
CC: Stephen Hemminger <shemminger@vyatta.com>
CC: Alan Stern <stern@rowland.harvard.edu>
CC: lttng-dev@lists.lttng.org
CC: rp@svcs.cs.pdx.edu
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Mon, 6 Jul 2015 19:01:22 +0000 (15:01 -0400)]
Fix: compat_futex.c: *uaddr should be read as volatile
Ensure that a volatile read is used when reading *uaddr in the
compatibility implementation for sys_futex FUTEX_WAIT.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Wed, 1 Jul 2015 14:03:39 +0000 (10:03 -0400)]
Cleanup: cast poll delay return value to void
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Michael Jeanson [Tue, 30 Jun 2015 15:04:15 +0000 (11:04 -0400)]
tests: Convert unit tests to TAP
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Michael Jeanson [Tue, 30 Jun 2015 15:04:14 +0000 (11:04 -0400)]
Fix: make benchmark test run in oot build
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Mon, 29 Jun 2015 22:45:07 +0000 (18:45 -0400)]
Fix: call_rcu_thread() affinity failure
Make call_rcu_thread() affine itself more persistently
Currently, URCU simply fails if a call_rcu_thread() fails to affine
itself. This is problematic when execution is constrained by cgroup
and hotunplugged CPUs. This commit therefore makes call_rcu_thread()
retry setting its affinity every 256 grace periods, but only if it
detects that it migrated to a different CPU. Since sched_getcpu() is
cheap on many architectures, this check is less costly than going
through a system call.
Reported-by: Michael Jeanson <mjeanson@efficios.com>
Suggested-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Mon, 29 Jun 2015 20:47:39 +0000 (16:47 -0400)]
Cleanup: cast poll delay return value to void
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Mon, 29 Jun 2015 20:36:01 +0000 (16:36 -0400)]
Cleanup: cast poll delay return value to void
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Mon, 29 Jun 2015 20:33:43 +0000 (16:33 -0400)]
Cleanup: cast poll delay return value to void
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Mon, 29 Jun 2015 20:32:46 +0000 (16:32 -0400)]
Cleanup: cast poll delay return value to void
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Mon, 29 Jun 2015 20:29:36 +0000 (16:29 -0400)]
Cleanup: cast poll() return value to void for delays
Explicitly state that we don't care about poll return value in those
cases.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Marc Kleine-Budde [Mon, 1 Jun 2015 13:16:30 +0000 (15:16 +0200)]
urcu: fix deprecation warning with new glibc
This patch fixes the following warning:
/usr/include/features.h:148:3: warning: #warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE" [-Wcpp]
# warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE"
From http://man7.org/linux/man-pages/man7/feature_test_macros.7.html:
_BSD_SOURCE (deprecated since glibc 2.20)
[...]
Since glibc 2.20, this macro is deprecated. It now has the same effect
as defining _DEFAULT_SOURCE, but generates a compile-time warning
(unless _DEFAULT_SOURCE is also defined). Use _DEFAULT_SOURCE instead.
To allow code that requires _BSD_SOURCE in glibc 2.19 and earlier and
_DEFAULT_SOURCE in glibc 2.20 and later to compile without warnings,
define both _BSD_SOURCE and _DEFAULT_SOURCE.
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Jeff Layton [Thu, 30 Apr 2015 11:50:05 +0000 (07:50 -0400)]
urcu: add cds_list_for_each_entry_safe_from macro
Same as cds_list_for_each_entry_safe, but starts at an arbitrary point
within the list instead of at the head.
Signed-off-by: Jeff Layton <jeff.layton@primarydata.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Thu, 23 Apr 2015 18:00:23 +0000 (14:00 -0400)]
Fix: deadlock when thread join is issued in read-side C.S.
The transitive dependency between:
RCU read-side C.S. -> synchronize_rcu -> rcu_gp_lock -> rcu_register_thread
and the dependency:
pthread_join -> awaiting for thread completion
Can block a thread on join, and thus have the side-effect of deadlocking
a thread doing a pthread_join while within a RCU read-side critical
section. This join would be awaiting for completion of register_thread or
rcu_unregister_thread, which may never complete because the rcu_gp_lock
is held by synchronize_rcu executed from another thread.
One solution to fix this is to add a new lock, rcu_registry_lock. This
lock now protects the thread registry. It is released between iterations
on the registry by synchronize_rcu, thus allowing thread
registration/unregistration to complete even though synchronize_rcu is
awaiting for RCU read-side critical sections to complete.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Reviewed-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
CC: Eugene Ivanov <Eugene.Ivanov@orc-group.com>
CC: Lai Jiangshan <laijs@cn.fujitsu.com>
CC: Stephen Hemminger <stephen@networkplumber.org>
Mathieu Desnoyers [Thu, 23 Apr 2015 19:41:25 +0000 (15:41 -0400)]
Fix: rename RCU_DEBUG to DEBUG_RCU in urcu-qsbr.h
Keep a mapping allowing to define RCU_DEBUG within urcu-qsbr.h for
compatibility purposes.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Mon, 6 Apr 2015 16:50:07 +0000 (12:50 -0400)]
Cleanup some c99 pedantic warnings
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Luca Boccassi [Wed, 25 Mar 2015 19:39:00 +0000 (19:39 +0000)]
Mark braced-groups within expressions with __extension__
Braced-groups within expressions are not valid ISO C, so
if a macro uses them and it's included in a project built
with -pedantic, the build will fail. GCC and CLANG do
support them as extension, so marking them as such allows
the build to complete even with -pedantic.
Signed-off-by: Luca Boccassi <lboccass@brocade.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Tue, 17 Mar 2015 21:53:21 +0000 (17:53 -0400)]
Fix: compat_futex_noasync race condition
The Userspace RCU compatibility layer around sys_futex has a race
condition which makes pretty much all "benchmark" tests hang pretty
quickly on non-Linux systems (tested on Mac OS X).
I narrowed it down to a bug in compat_futex_noasync: this compat layer
uses a single pthread mutex and condition variable for all callers,
independently of their uaddr. The FUTEX_WAKE performs a pthread cond
broadcast to all waiters. FUTEX_WAIT must then compare *uaddr with val
to see which thread has been awakened.
Unfortunately, the check was not done again after each return from
pthread_cond_wait(), thus causing the race.
This race affects threads using the futex_noasync() compatibility layer
concurrently, thus it affects only on non-Linux systems.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Mon, 16 Mar 2015 01:15:41 +0000 (21:15 -0400)]
tests: Use stderr redirection for time output
Allows using Mac OS X time command in tests.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Mon, 16 Mar 2015 01:09:15 +0000 (21:09 -0400)]
Fix: use space after rpath for OS X ld
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mathieu Desnoyers [Mon, 16 Mar 2015 01:02:13 +0000 (21:02 -0400)]
Fix: move transparent union attribute after union declaration for clang
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Jonathan Rajotte [Tue, 24 Feb 2015 03:29:24 +0000 (22:29 -0500)]
Configure: add check for used type
Signed-off-by: Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Jonathan Rajotte [Tue, 24 Feb 2015 03:29:23 +0000 (22:29 -0500)]
Configure: add missing check of headers
Signed-off-by: Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Jonathan Rajotte [Tue, 24 Feb 2015 03:29:22 +0000 (22:29 -0500)]
Configure: add missing check for funcs: memset, strerror
Signed-off-by: Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Emilio G. Cota [Tue, 3 Feb 2015 17:53:46 +0000 (12:53 -0500)]
Fix: documentation: urcu-pointer.h: s/rcu_dereference_pointer/rcu_dereference/
Signed-off-by: Emilio G. Cota <cota@braap.org>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Lai Jiangshan [Tue, 2 Dec 2014 09:32:32 +0000 (17:32 +0800)]
urcu-bp/urcu-qsbr: remove unneeded DEBUG_YIELD code
They were moved to debug-yield.c
Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
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