| commit | 3fb82d56ad003e804923185316236f26b30dfdd5 | |
| author | Suresh Siddha <suresh.b.siddha@intel.com> | |
| Wed, 24 Nov 2010 00:11:40 +0000 (23 16:11 -0800) | ||
| committer | H. Peter Anvin <hpa@linux.intel.com> | |
| Tue, 14 Dec 2010 00:23:56 +0000 (13 16:23 -0800) | ||
| tree | 3ee08bef7cdc0f0ed3b69be5609b53c44299a229 | treesnapshot (tar.gz zip) |
| parent | cf7d7e5a1980d1116ee152d25dac382b112b9c17 | commitdiff |
x86, suspend: Avoid unnecessary smp alternatives switch during suspend/resume
During suspend, we disable all the non boot cpus. And during resume we bring
them all back again. So no need to do alternatives_smp_switch() in between.
On my core 2 based laptop, this speeds up the suspend path by 15msec and the
resume path by 5 msec (suspend/resume speed up differences can be attributed
to the different P-states that the cpu is in during suspend/resume).
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
LKML-Reference: <1290557500.4946.8.camel@sbsiddha-MOBL3.sc.intel.com>
Cc: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
During suspend, we disable all the non boot cpus. And during resume we bring
them all back again. So no need to do alternatives_smp_switch() in between.
On my core 2 based laptop, this speeds up the suspend path by 15msec and the
resume path by 5 msec (suspend/resume speed up differences can be attributed
to the different P-states that the cpu is in during suspend/resume).
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
LKML-Reference: <1290557500.4946.8.camel@sbsiddha-MOBL3.sc.intel.com>
Cc: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
| arch/x86/include/asm/alternative.h | diffblobblamehistory | |
| arch/x86/kernel/alternative.c | diffblobblamehistory | |
| arch/x86/kernel/smpboot.c | diffblobblamehistory | |
| kernel/cpu.c | diffblobblamehistory |