diff options
| author | Boris Ostrovsky <[email protected]> | 2013-03-23 09:36:36 -0400 |
|---|---|---|
| committer | H. Peter Anvin <[email protected]> | 2013-04-10 11:25:10 -0700 |
| commit | 511ba86e1d386f671084b5d0e6f110bb30b8eeb2 (patch) | |
| tree | 1fe3621ebaf43ad5fb5ab644500676f2f158153f /lib/cpu-notifier-error-inject.c | |
| parent | 1160c2779b826c6f5c08e5cc542de58fd1f667d5 (diff) | |
x86, mm: Patch out arch_flush_lazy_mmu_mode() when running on bare metal
Invoking arch_flush_lazy_mmu_mode() results in calls to
preempt_enable()/disable() which may have performance impact.
Since lazy MMU is not used on bare metal we can patch away
arch_flush_lazy_mmu_mode() so that it is never called in such
environment.
[ hpa: the previous patch "Fix vmalloc_fault oops during lazy MMU
updates" may cause a minor performance regression on
bare metal. This patch resolves that performance regression. It is
somewhat unclear to me if this is a good -stable candidate. ]
Signed-off-by: Boris Ostrovsky <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Tested-by: Josh Boyer <[email protected]>
Tested-by: Konrad Rzeszutek Wilk <[email protected]>
Acked-by: Borislav Petkov <[email protected]>
Signed-off-by: Konrad Rzeszutek Wilk <[email protected]>
Signed-off-by: H. Peter Anvin <[email protected]>
Cc: <[email protected]> SEE NOTE ABOVE
Diffstat (limited to 'lib/cpu-notifier-error-inject.c')
0 files changed, 0 insertions, 0 deletions