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lttng-ust(3): document liblttng-ust-fd
[lttng-ust.git]
/
libringbuffer
/
frontend_api.h
diff --git
a/libringbuffer/frontend_api.h
b/libringbuffer/frontend_api.h
index 5ddb8ac460951f0bae59a3f098cf6bca510a3799..140159739feebc954f68d39b33806e3778f4ca01 100644
(file)
--- a/
libringbuffer/frontend_api.h
+++ b/
libringbuffer/frontend_api.h
@@
-167,6
+167,8
@@
int lib_ring_buffer_reserve(const struct lttng_ust_lib_ring_buffer_config *confi
buf = shmp(handle, chan->backend.buf[ctx->cpu].shmp);
else
buf = shmp(handle, chan->backend.buf[0].shmp);
buf = shmp(handle, chan->backend.buf[ctx->cpu].shmp);
else
buf = shmp(handle, chan->backend.buf[0].shmp);
+ if (caa_unlikely(!buf))
+ return -EIO;
if (caa_unlikely(uatomic_read(&buf->record_disabled)))
return -EAGAIN;
ctx->buf = buf;
if (caa_unlikely(uatomic_read(&buf->record_disabled)))
return -EAGAIN;
ctx->buf = buf;
@@
-250,11
+252,16
@@
void lib_ring_buffer_commit(const struct lttng_ust_lib_ring_buffer_config *confi
unsigned long offset_end = ctx->buf_offset;
unsigned long endidx = subbuf_index(offset_end - 1, chan);
unsigned long commit_count;
unsigned long offset_end = ctx->buf_offset;
unsigned long endidx = subbuf_index(offset_end - 1, chan);
unsigned long commit_count;
+ struct commit_counters_hot *cc_hot = shmp_index(handle,
+ buf->commit_hot, endidx);
+
+ if (caa_unlikely(!cc_hot))
+ return;
/*
* Must count record before incrementing the commit count.
*/
/*
* Must count record before incrementing the commit count.
*/
- subbuffer_count_record(config, &buf->backend, endidx, handle);
+ subbuffer_count_record(config,
ctx,
&buf->backend, endidx, handle);
/*
* Order all writes to buffer before the commit count update that will
/*
* Order all writes to buffer before the commit count update that will
@@
-262,7
+269,7
@@
void lib_ring_buffer_commit(const struct lttng_ust_lib_ring_buffer_config *confi
*/
cmm_smp_wmb();
*/
cmm_smp_wmb();
- v_add(config, ctx->slot_size, &
shmp_index(handle, buf->commit_hot, endidx)
->cc);
+ v_add(config, ctx->slot_size, &
cc_hot
->cc);
/*
* commit count read can race with concurrent OOO commit count updates.
/*
* commit count read can race with concurrent OOO commit count updates.
@@
-282,7
+289,7
@@
void lib_ring_buffer_commit(const struct lttng_ust_lib_ring_buffer_config *confi
* count reaches back the reserve offset for a specific sub-buffer,
* which is completely independent of the order.
*/
* count reaches back the reserve offset for a specific sub-buffer,
* which is completely independent of the order.
*/
- commit_count = v_read(config, &
shmp_index(handle, buf->commit_hot, endidx)
->cc);
+ commit_count = v_read(config, &
cc_hot
->cc);
lib_ring_buffer_check_deliver(config, buf, chan, offset_end - 1,
commit_count, endidx, handle, ctx->tsc);
lib_ring_buffer_check_deliver(config, buf, chan, offset_end - 1,
commit_count, endidx, handle, ctx->tsc);
@@
-290,8
+297,8
@@
void lib_ring_buffer_commit(const struct lttng_ust_lib_ring_buffer_config *confi
* Update used size at each commit. It's needed only for extracting
* ring_buffer buffers from vmcore, after crash.
*/
* Update used size at each commit. It's needed only for extracting
* ring_buffer buffers from vmcore, after crash.
*/
- lib_ring_buffer_write_commit_counter(config, buf, chan,
endidx,
- offset_end, commit_count, handle);
+ lib_ring_buffer_write_commit_counter(config, buf, chan,
+ offset_end, commit_count, handle
, cc_hot
);
}
/**
}
/**
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