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| author |  Ming Lei <ming.lei@redhat.com>
| 2020-10-01 23:48:41 +0800 |
|---|---|---|
| committer |  Jens Axboe <axboe@kernel.dk>
| 2020-10-06 07:29:36 -0600 |
| commit | 2b0d3d3e4fcfb19d10f9a82910b8f0f05c56ee3e (patch) | |
| tree | 1ffab7ee6f2455b56c8128379ab032e06df8cf8e /sound/core/pcm_misc.c | |
| parent | block: warn if !__GFP_DIRECT_RECLAIM in bio_crypt_set_ctx() (diff) | |
| download | linux-2b0d3d3e4fcfb19d10f9a82910b8f0f05c56ee3e.tar.gz linux-2b0d3d3e4fcfb19d10f9a82910b8f0f05c56ee3e.tar.bz2 linux-2b0d3d3e4fcfb19d10f9a82910b8f0f05c56ee3e.zip | |
percpu_ref: reduce memory footprint of percpu_ref in fast path
'struct percpu_ref' is often embedded into one user structure, and the
instance is usually referenced in fast path, however actually only
'percpu_count_ptr' is needed in fast path.
So move other fields into one new structure of 'percpu_ref_data', and
allocate it dynamically via kzalloc(), then memory footprint of
'percpu_ref' in fast path is reduced a lot and becomes suitable to put
into hot cacheline of user structure.
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Tested-by: Veronika Kabatova <vkabatov@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Acked-by: Tejun Heo <tj@kernel.org>
Cc: Sagi Grimberg <sagi@grimberg.me>
Cc: Tejun Heo <tj@kernel.org>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'sound/core/pcm_misc.c')
0 files changed, 0 insertions, 0 deletions