diff options
| author | Laura Abbott <[email protected]> | 2015-07-20 14:47:58 -0700 |
|---|---|---|
| committer | Ingo Molnar <[email protected]> | 2015-07-21 07:51:38 +0200 |
| commit | b51ef52df71cb28e9d90cd1d48b79bf19f0bab06 (patch) | |
| tree | b2f6d97f1f5b4e6a743d8e278d3f3a176b69735c /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | 9d634c410b07be7bf637ea03362d3ff132088fe3 (diff) | |
x86/cpu: Restore MSR_IA32_ENERGY_PERF_BIAS after resume
MSR_IA32_ENERGY_PERF_BIAS is lost after suspend/resume:
x86_energy_perf_policy -r before
cpu0: 0x0000000000000006
cpu1: 0x0000000000000006
cpu2: 0x0000000000000006
cpu3: 0x0000000000000006
cpu4: 0x0000000000000006
cpu5: 0x0000000000000006
cpu6: 0x0000000000000006
cpu7: 0x0000000000000006
after
cpu0: 0x0000000000000000
cpu1: 0x0000000000000006
cpu2: 0x0000000000000006
cpu3: 0x0000000000000006
cpu4: 0x0000000000000006
cpu5: 0x0000000000000006
cpu6: 0x0000000000000006
cpu7: 0x0000000000000006
Resulting in inconsistent energy policy settings across CPUs.
This register is set via init_intel() at bootup. During resume,
the secondary CPUs are brought online again and init_intel() is
callled which re-initializes the register. The boot CPU however
never reinitializes the register.
Add a syscore callback to reinitialize the register for the boot CPU.
Signed-off-by: Laura Abbott <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
Diffstat (limited to 'tools/perf/scripts/python/export-to-postgresql.py')
0 files changed, 0 insertions, 0 deletions