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authorMike Galbraith <bitbucket@online.de>2014-01-18 17:14:44 +0100
committerIngo Molnar <mingo@kernel.org>2015-03-16 11:14:22 +0100
commitf8e617f4582995f7c25ef25b4167213120ad122b (patch)
treea7c1a1b1e45b27cc9e36a76ab83396a0e70b04e2 /arch/arm64/Kconfig
parentb253149b843f89cd300cbdbea27ce1f847506f99 (diff)
downloadlinux-f8e617f4582995f7c25ef25b4167213120ad122b.tar.bz2
sched/idle/x86: Optimize unnecessary mwait_idle() resched IPIs
To fully take advantage of MWAIT, apparently the CLFLUSH instruction needs another quirk on certain CPUs: proper barriers around it on certain machines. On a Q6600 SMP system, pipe-test scheduling performance, cross core, improves significantly: 3.8.13 487.2 KHz 1.000 3.13.0-master 415.5 KHz .852 3.13.0-master+ 415.2 KHz .852 + restore mwait_idle 3.13.0-master++ 488.5 KHz 1.002 + restore mwait_idle + IPI fix Since X86_BUG_CLFLUSH_MONITOR is already a quirk, don't create a separate quirk for the extra smp_mb()s. Signed-off-by: Mike Galbraith <bitbucket@online.de> Cc: <stable@vger.kernel.org> # 3.10+ Cc: Borislav Petkov <bp@alien8.de> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Ian Malone <ibmalone@gmail.com> Cc: Josh Boyer <jwboyer@redhat.com> Cc: Len Brown <len.brown@intel.com> Cc: Len Brown <lenb@kernel.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1390061684.5566.4.camel@marge.simpson.net [ Ported to recent kernel, added comments about the quirk. ] Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/arm64/Kconfig')
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