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Performance: Only dereference shmp once
[lttng-ust.git]
/
libringbuffer
/
frontend_api.h
diff --git
a/libringbuffer/frontend_api.h
b/libringbuffer/frontend_api.h
index 5ddb8ac460951f0bae59a3f098cf6bca510a3799..eea2a8db579686995d1c204995fdb4dcda51668b 100644
(file)
--- a/
libringbuffer/frontend_api.h
+++ b/
libringbuffer/frontend_api.h
@@
-250,6
+250,8
@@
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);
/*
* Must count record before incrementing the commit count.
/*
* Must count record before incrementing the commit count.
@@
-262,7
+264,7
@@
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
+284,7
@@
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
+292,8
@@
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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