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| author |   Mike Marciniszyn <mike.marciniszyn@intel.com> | 2015-12-07 15:39:22 -0500 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-12-21 14:00:17 -0800 |
| commit | a054374f15428cbc1d9cb9cba17ce870eaa7d60f (patch) | |
| tree | 07dd3a9d52cb4c409fd799c65ab93e699a6e4c2f /drivers/staging/rdma/hfi1/pio.h | |
| parent | staging/rdma/hfi1: fix sdma build failures to always clean up (diff) | |
| download | linux-dev-a054374f15428cbc1d9cb9cba17ce870eaa7d60f.tar.xz linux-dev-a054374f15428cbc1d9cb9cba17ce870eaa7d60f.zip | |
staging/rdma/hfi1: convert buffers allocated atomic to per cpu
Profiling has shown the the atomic is a performance issue
for the pio hot path.
If multiple cpus allocated an sc's buffer, the cacheline
containing the atomic will bounce from L0 to L0.
Convert the atomic to a percpu variable.
Reviewed-by: Jubin John <jubin.john@intel.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/staging/rdma/hfi1/pio.h')
| -rw-r--r-- | drivers/staging/rdma/hfi1/pio.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/staging/rdma/hfi1/pio.h b/drivers/staging/rdma/hfi1/pio.h index 0bb885ca3cfb..53d3e0a79375 100644 --- a/drivers/staging/rdma/hfi1/pio.h +++ b/drivers/staging/rdma/hfi1/pio.h @@ -130,7 +130,7 @@ struct send_context { spinlock_t credit_ctrl_lock ____cacheline_aligned_in_smp; u64 credit_ctrl; /* cache for credit control */ u32 credit_intr_count; /* count of credit intr users */ - atomic_t buffers_allocated; /* count of buffers allocated */ + u32 __percpu *buffers_allocated;/* count of buffers allocated */ wait_queue_head_t halt_wait; /* wait until kernel sees interrupt */ }; |