Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=aec103bfa60e9f72bd66a144236592f54b986a03
Commit: aec103bfa60e9f72bd66a144236592f54b986a03
Parent: 3cdc7fc7fd5bd1ead75758dfadef609a6e9fd3de
Author: de Dinechin, Christophe (Integrity VM) <[EMAIL PROTECTED]>
AuthorDate: Thu Dec 13 15:03:07 2007 +0000
Committer: Tony Luck <[EMAIL PROTECTED]>
CommitDate: Tue Dec 18 16:56:50 2007 -0800
[IA64] Avoid unnecessary TLB flushes when allocating memory
Improve performance of memory allocations on ia64 by avoiding a global TLB
purge to purge a single page from the file cache. This happens whenever we
evict a page from the buffer cache to make room for some other allocation.
Test case: Run 'find /usr -type f | xargs cat > /dev/null' in the
background to fill the buffer cache, then run something that uses memory,
e.g. 'gmake -j50 install'. Instrumentation showed that the number of
global TLB purges went from a few millions down to about 170 over a 12
hours run of the above.
The performance impact is particularly noticeable under virtualization,
because a virtual TLB is generally both larger and slower to purge than
a physical one.
Signed-off-by: Christophe de Dinechin <[EMAIL PROTECTED]>
Signed-off-by: Tony Luck <[EMAIL PROTECTED]>
---
arch/ia64/mm/tlb.c | 18 +++++++++++++++---
1 files changed, 15 insertions(+), 3 deletions(-)
diff --git a/arch/ia64/mm/tlb.c b/arch/ia64/mm/tlb.c
index cef1647..655da24 100644
--- a/arch/ia64/mm/tlb.c
+++ b/arch/ia64/mm/tlb.c
@@ -10,6 +10,7 @@
* IPI based ptc implementation and A-step IPI implementation.
* Rohit Seth <[EMAIL PROTECTED]>
* Ken Chen <[EMAIL PROTECTED]>
+ * Christophe de Dinechin <[EMAIL PROTECTED]>: Avoid ptc.e on memory allocation
*/
#include <linux/module.h>
#include <linux/init.h>
@@ -89,9 +90,16 @@ ia64_global_tlb_purge (struct mm_struct *mm, unsigned long
start,
{
static DEFINE_SPINLOCK(ptcg_lock);
- if (mm != current->active_mm || !current->mm) {
- flush_tlb_all();
- return;
+ struct mm_struct *active_mm = current->active_mm;
+
+ if (mm != active_mm) {
+ /* Restore region IDs for mm */
+ if (mm && active_mm) {
+ activate_context(mm);
+ } else {
+ flush_tlb_all();
+ return;
+ }
}
/* HW requires global serialization of ptc.ga. */
@@ -107,6 +115,10 @@ ia64_global_tlb_purge (struct mm_struct *mm, unsigned long
start,
} while (start < end);
}
spin_unlock(&ptcg_lock);
+
+ if (mm != active_mm) {
+ activate_context(active_mm);
+ }
}
void
-
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