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authorMing Lei <ming.lei@redhat.com>2020-10-01 23:48:41 +0800
committerJens Axboe <axboe@kernel.dk>2020-10-06 07:29:36 -0600
commit2b0d3d3e4fcfb19d10f9a82910b8f0f05c56ee3e (patch)
tree1ffab7ee6f2455b56c8128379ab032e06df8cf8e /drivers/infiniband
parentcf785af19319f9fc0fc0c0604d259f1ef31b502f (diff)
downloadlinux-2b0d3d3e4fcfb19d10f9a82910b8f0f05c56ee3e.tar.bz2
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 'drivers/infiniband')
-rw-r--r--drivers/infiniband/sw/rdmavt/mr.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/infiniband/sw/rdmavt/mr.c b/drivers/infiniband/sw/rdmavt/mr.c
index 2f7c25fea44a..8490fdb9c91e 100644
--- a/drivers/infiniband/sw/rdmavt/mr.c
+++ b/drivers/infiniband/sw/rdmavt/mr.c
@@ -499,7 +499,7 @@ static int rvt_check_refs(struct rvt_mregion *mr, const char *t)
rvt_pr_err(rdi,
"%s timeout mr %p pd %p lkey %x refcount %ld\n",
t, mr, mr->pd, mr->lkey,
- atomic_long_read(&mr->refcount.count));
+ atomic_long_read(&mr->refcount.data->count));
rvt_get_mr(mr);
return -EBUSY;
}