Author: mjg
Date: Sat Sep 22 11:39:30 2018
New Revision: 338885
URL: https://svnweb.freebsd.org/changeset/base/338885
Log:
vfs: __predict common case in VFS_EPILOGUE/PROLOGUE
NFS is the only in-tree filesystem using the feature, but all ops test
for it.
Currently the resulting sigdefer calls have to be jumped over in the
common case.
This is a bandaid, longer term fix will move this feature away.
Approved by: re (kib)
Modified:
head/sys/sys/signalvar.h
Modified: head/sys/sys/signalvar.h
==============================================================================
--- head/sys/sys/signalvar.h Sat Sep 22 06:50:56 2018 (r338884)
+++ head/sys/sys/signalvar.h Sat Sep 22 11:39:30 2018 (r338885)
@@ -349,7 +349,7 @@ static inline int
sigdeferstop(int mode)
{
- if (mode == SIGDEFERSTOP_NOP)
+ if (__predict_true(mode == SIGDEFERSTOP_NOP))
return (SIGDEFERSTOP_VAL_NCHG);
return (sigdeferstop_impl(mode));
}
@@ -358,7 +358,7 @@ static inline void
sigallowstop(int prev)
{
- if (prev == SIGDEFERSTOP_VAL_NCHG)
+ if (__predict_true(prev == SIGDEFERSTOP_VAL_NCHG))
return;
sigallowstop_impl(prev);
}
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