Use the memory pool instead of kmalloc

Replace the use of kmalloc/kfree in the tracepoint probes that need
dynamic allocation with the tracepoint memory pool alloc/free.

Signed-off-by: Julien Desfossez <jdesfossez@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

diff --git a/instrumentation/syscalls/headers/syscalls_pointers_override.h b/instrumentation/syscalls/headers/syscalls_pointers_override.h
index 184f3a96e8c08b0b0604999531e17f70af817e56..cdc5645001a06fd98ab0b01d12a18a040d9df2b0 100644 (file)
--- a/instrumentation/syscalls/headers/syscalls_pointers_override.h
+++ b/instrumentation/syscalls/headers/syscalls_pointers_override.h
@@ -100,9 +100,8 @@ SC_LTTNG_TRACEPOINT_EVENT(pipe2,
                }                                                                       \
                                                                                        \
                if (inp) {                                                              \
-                       tp_locvar->fds_in = kmalloc(                                    \
-                                       tp_locvar->nr_ulong * sizeof(unsigned long),    \
-                                       GFP_ATOMIC | GFP_NOWAIT);                       \
+                       tp_locvar->fds_in = lttng_tp_mempool_alloc(                             \
+                                       tp_locvar->nr_ulong * sizeof(unsigned long));                   \
                        if (!tp_locvar->fds_in)                                         \
                                goto error;                                             \
                                                                                        \
@@ -113,9 +112,8 @@ SC_LTTNG_TRACEPOINT_EVENT(pipe2,
                                goto error;                                             \
                }                                                                       \
                if (outp) {                                                             \
-                       tp_locvar->fds_out = kmalloc(                                   \
-                                       tp_locvar->nr_ulong * sizeof(unsigned long),    \
-                                       GFP_ATOMIC | GFP_NOWAIT);                       \
+                       tp_locvar->fds_out = lttng_tp_mempool_alloc(                            \
+                                       tp_locvar->nr_ulong * sizeof(unsigned long));   \
                        if (!tp_locvar->fds_out)                                        \
                                goto error;                                             \
                                                                                        \
@@ -126,9 +124,8 @@ SC_LTTNG_TRACEPOINT_EVENT(pipe2,
                                goto error;                                             \
                }                                                                       \
                if (exp) {                                                              \
-                       tp_locvar->fds_ex = kmalloc(                                    \
-                                       tp_locvar->nr_ulong * sizeof(unsigned long),    \
-                                       GFP_ATOMIC | GFP_NOWAIT);                       \
+                       tp_locvar->fds_ex = lttng_tp_mempool_alloc(                             \
+                                       tp_locvar->nr_ulong * sizeof(unsigned long));   \
                        if (!tp_locvar->fds_ex)                                         \
                                goto error;                                             \
                                                                                        \
@@ -221,9 +218,9 @@ end:        ; /* Label at end of compound statement. */                                     \
        )
 
 #define LTTNG_SYSCALL_SELECT_code_post \
-       kfree(tp_locvar->fds_in);       \
-       kfree(tp_locvar->fds_out);      \
-       kfree(tp_locvar->fds_ex);
+       lttng_tp_mempool_free(tp_locvar->fds_in);       \
+       lttng_tp_mempool_free(tp_locvar->fds_out);      \
+       lttng_tp_mempool_free(tp_locvar->fds_ex);
 
 #if defined(CONFIG_X86_32) || defined(CONFIG_X86_64) || defined(CONFIG_ARM)
 #define OVERRIDE_32_select
@@ -413,8 +410,7 @@ static struct lttng_type lttng_pollfd_elem = {
        {                                                                               \
                int err;                                                                \
                                                                                        \
-               tp_locvar->fds = kmalloc(tp_locvar->alloc_fds,                          \
-                               GFP_ATOMIC | GFP_NOWAIT);                               \
+               tp_locvar->fds = lttng_tp_mempool_alloc(tp_locvar->alloc_fds);          \
                if (!tp_locvar->fds)                                                    \
                        goto error;                                                     \
                err = lib_ring_buffer_copy_from_user_check_nofault(                     \
@@ -494,7 +490,7 @@ end:                                                                                        \
        )
 
 #define LTTNG_SYSCALL_POLL_code_post   \
-       kfree(tp_locvar->fds);
+       lttng_tp_mempool_free(tp_locvar->fds);
 
 #if defined(CONFIG_X86_32) || defined(CONFIG_X86_64) || defined(CONFIG_ARM)
 #define OVERRIDE_32_poll
@@ -761,9 +757,8 @@ static struct lttng_type lttng_epoll_wait_elem = {
                        tp_locvar->fds_length = ret;                            \
                }                                                               \
                                                                                \
-               tp_locvar->events = kmalloc(                                    \
-                       maxalloc * sizeof(struct epoll_event),                  \
-                       GFP_ATOMIC | GFP_NOWAIT);                               \
+               tp_locvar->events = lttng_tp_mempool_alloc(                             \
+                       maxalloc * sizeof(struct epoll_event));                 \
                if (!tp_locvar->events) {                                       \
                        tp_locvar->fds_length = 0;                              \
                        goto skip_code;                                         \
@@ -805,7 +800,7 @@ static struct lttng_type lttng_epoll_wait_elem = {
 
 #define LTTNG_SYSCALL_EPOLL_WAIT_code_post     \
        sc_out(                                 \
-               kfree(tp_locvar->events);       \
+               lttng_tp_mempool_free(tp_locvar->events);       \
        )
 
 

diff --git a/probes/lttng-tracepoint-event-impl.h b/probes/lttng-tracepoint-event-impl.h
index 61f1c2d8fb73b5bbc191e219077c6f498adff3be..0842dcc0e210e491a92eb91a8739748460003d5b 100644 (file)
--- a/probes/lttng-tracepoint-event-impl.h
+++ b/probes/lttng-tracepoint-event-impl.h
@@ -34,6 +34,7 @@
 #include <wrapper/rcu.h>
 #include <lttng-events.h>
 #include <lttng-tracer-core.h>
+#include <lttng-tp-mempool.h>
 
 #define __LTTNG_NULL_STRING    "(null)"