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authorFenghua Yu <fenghua.yu@intel.com>2008-04-04 11:05:59 -0700
committerTony Luck <tony.luck@intel.com>2008-04-04 11:05:59 -0700
commit2046b94e7c4fce92eb8165c2c36c6478f4927178 (patch)
tree0dbbdf17d64b521f2debcc8677368ceec8805d8c /include/asm-ia64/tlbflush.h
parente315c121a858499d84dc88c499046b9f10bb61ec (diff)
[IA64] Multiple outstanding ptc.g instruction support
According to SDM2.2, Itanium supports multiple outstanding ptc.g instructions. But current kernel function ia64_global_tlb_purge() uses a spinlock to serialize ptc.g instructions issued by multiple processors. This serialization might have scalability issue on a big SMP machine where many processors could purge TLB in parallel. The patch fixes this problem by issuing multiple ptc.g instructions in ia64_global_tlb_purge(). It also adds support for the "PALO" table to get a platform view of the max number of outstanding ptc.g instructions (which may be different from the processor view found from PAL_VM_SUMMARY). PALO specification can be found at: http://www.dig64.org/home/DIG64_PALO_R1_0.pdf spinaphore implementation by Matthew Wilcox. Signed-off-by: Fenghua Yu <fenghua.yu@intel.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'include/asm-ia64/tlbflush.h')
-rw-r--r--include/asm-ia64/tlbflush.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/asm-ia64/tlbflush.h b/include/asm-ia64/tlbflush.h
index 7774a1cac0cc..3be25dfed164 100644
--- a/include/asm-ia64/tlbflush.h
+++ b/include/asm-ia64/tlbflush.h
@@ -17,6 +17,7 @@
* Now for some TLB flushing routines. This is the kind of stuff that
* can be very expensive, so try to avoid them whenever possible.
*/
+extern void setup_ptcg_sem(int max_purges, int from_palo);
/*
* Flush everything (kernel mapping may also have changed due to