NFS: Don't run wake_up_bit() when nobody is waiting...

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"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>

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Trond Myklebust 2017-07-11 17:53:48 -04:00 • committed by Anna Schumaker

parent 00422483ad

commit 301bfa4830

2 changed files with 18 additions and 1 deletions

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17

fs/nfs/pagelist.c

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2

include/linux/nfs_page.h

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