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| author |   Christoph Lameter <clameter@sgi.com> | 2006-03-28 22:54:38 -0800 |
|---|---|---|
| committer |   Tony Luck <tony.luck@intel.com> | 2006-04-07 23:08:16 -0700 |
| commit | 0ffe984917b9cd6ecc19ffbc06f35869d8c18df8 (patch) | |
| tree | 49b54ea585dcd657083c8b755726820b002ae75a /arch/ia64/mm/fault.c | |
| parent | [IA64] Failure to resume after INIT in user space (diff) | |
| download | linux-dev-0ffe984917b9cd6ecc19ffbc06f35869d8c18df8.tar.xz linux-dev-0ffe984917b9cd6ecc19ffbc06f35869d8c18df8.zip | |
[IA64] Prefetch mmap_sem in ia64_do_page_fault()
Take a hint from an x86_64 optimization by Arjan van de Ven and use it
for ia64. See a9ba9a3b3897561d01e04cd21433746df46548c0
Prefetch the mmap_sem, which is critical for the performance of the page fault
handler.
Note: mm may be NULL but I guess that is safe.
See 458f935527372499b714bf4f8e646a68bb0f52e3
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'arch/ia64/mm/fault.c')
| -rw-r--r-- | arch/ia64/mm/fault.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/ia64/mm/fault.c b/arch/ia64/mm/fault.c index af7eb087dca7..d98ec49570b8 100644 --- a/arch/ia64/mm/fault.c +++ b/arch/ia64/mm/fault.c @@ -60,6 +60,9 @@ ia64_do_page_fault (unsigned long address, unsigned long isr, struct pt_regs *re struct siginfo si; unsigned long mask; + /* mmap_sem is performance critical.... */ + prefetchw(&mm->mmap_sem); + /* * If we're in an interrupt or have no user context, we must not take the fault.. */ |