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| author | H.J. Lu <hjl.tools@gmail.com> | 2020-07-06 11:48:09 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2020-07-06 11:48:42 -0700 |
| commit | 3f4b61a0b8de67ef9f20737919c713ddfc4bd620 (patch) | |
| tree | 521cfbc4f297a2fe5d4fc91e6c30d590f1225027 /manual | |
| parent | 6c010c5dde1735f93cc3a6597cdcc2b482af85f8 (diff) | |
| download | glibc-3f4b61a0b8de67ef9f20737919c713ddfc4bd620.tar.gz | |
x86: Add thresholds for "rep movsb/stosb" to tunables
Add x86_rep_movsb_threshold and x86_rep_stosb_threshold to tunables
to update thresholds for "rep movsb" and "rep stosb" at run-time.
Note that the user specified threshold for "rep movsb" smaller than
the minimum threshold will be ignored.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Diffstat (limited to 'manual')
| -rw-r--r-- | manual/tunables.texi | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/manual/tunables.texi b/manual/tunables.texi index ec18b10834..4e68c7ff91 100644 --- a/manual/tunables.texi +++ b/manual/tunables.texi @@ -396,6 +396,22 @@ to set threshold in bytes for non temporal store. This tunable is specific to i386 and x86-64. @end deftp +@deftp Tunable glibc.cpu.x86_rep_movsb_threshold +The @code{glibc.cpu.x86_rep_movsb_threshold} tunable allows the user to +set threshold in bytes to start using "rep movsb". The value must be +greater than zero, and currently defaults to 2048 bytes. + +This tunable is specific to i386 and x86-64. +@end deftp + +@deftp Tunable glibc.cpu.x86_rep_stosb_threshold +The @code{glibc.cpu.x86_rep_stosb_threshold} tunable allows the user to +set threshold in bytes to start using "rep stosb". The value must be +greater than zero, and currently defaults to 2048 bytes. + +This tunable is specific to i386 and x86-64. +@end deftp + @deftp Tunable glibc.cpu.x86_ibt The @code{glibc.cpu.x86_ibt} tunable allows the user to control how indirect branch tracking (IBT) should be enabled. Accepted values are |