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| author | Trond Myklebust <trond.myklebust@primarydata.com> | 2017-07-11 17:53:48 -0400 |
|---|---|---|
| committer | Anna Schumaker <Anna.Schumaker@Netapp.com> | 2017-07-13 17:12:07 -0400 |
| commit | b4f937cffa66b3d56eb8f586e620d0b223a281a3 (patch) | |
| tree | 1e86b94a773529cae5a3144e03ff7b35f7673188 /tools/perf/scripts/python/stackcollapse.py | |
| parent | nfs: add export operations (diff) | |
| download | linux-b4f937cffa66b3d56eb8f586e620d0b223a281a3.tar.gz linux-b4f937cffa66b3d56eb8f586e620d0b223a281a3.zip | |
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 'tools/perf/scripts/python/stackcollapse.py')
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