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authorTrond Myklebust <trond.myklebust@primarydata.com>2017-07-12 00:53:48 +0300
committerAnna Schumaker <Anna.Schumaker@Netapp.com>2017-07-14 00:12:07 +0300
commitb4f937cffa66b3d56eb8f586e620d0b223a281a3 (patch)
tree1e86b94a773529cae5a3144e03ff7b35f7673188 /include
parent20fa19027286983ab2734b5910c4a687436e0c31 (diff)
downloadlinux-b4f937cffa66b3d56eb8f586e620d0b223a281a3.tar.xz
NFS: Don't run wake_up_bit() when nobody is waiting...
"perf lock" shows fairly heavy contention for the bit waitqueue locks when doing an I/O heavy workload. Use a bit to tell whether or not there has been contention for a lock so that we can optimise away the bit waitqueue options in those cases. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Diffstat (limited to 'include')
-rw-r--r--include/linux/nfs_page.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/nfs_page.h b/include/linux/nfs_page.h
index abbee2d15dce..d67b67ae6c8b 100644
--- a/include/linux/nfs_page.h
+++ b/include/linux/nfs_page.h
@@ -33,6 +33,8 @@ enum {
PG_UPTODATE, /* page group sync bit in read path */
PG_WB_END, /* page group sync bit in write path */
PG_REMOVE, /* page group sync bit in write path */
+ PG_CONTENDED1, /* Is someone waiting for a lock? */
+ PG_CONTENDED2, /* Is someone waiting for a lock? */
};
struct nfs_inode;