Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=3b1d92c56514987010bb0201b5c71aeb633fc4f8
Commit: 3b1d92c56514987010bb0201b5c71aeb633fc4f8
Parent: 8da3430d8a7f885c2bf65121181d76c9d290a86e
Author: Mel Gorman <[EMAIL PROTECTED]>
AuthorDate: Sun May 6 14:49:30 2007 -0700
Committer: Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Mon May 7 12:12:53 2007 -0700
Do not disable interrupts when reading min_free_kbytes
The sysctl handler for min_free_kbytes calls setup_per_zone_pages_min() on
read or write. This function iterates through every zone and calls
spin_lock_irqsave() on the zone LRU lock. When reading min_free_kbytes,
this is a total waste of time that disables interrupts on the local
processor. It might even be noticable machines with large numbers of zones
if a process started constantly reading min_free_kbytes.
This patch only calls setup_per_zone_pages_min() only on write. Tested on
an x86 laptop and it did the right thing.
Signed-off-by: Mel Gorman <[EMAIL PROTECTED]>
Acked-by: Christoph Lameter <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
mm/page_alloc.c | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index f564717..542fc08 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3199,7 +3199,8 @@ int min_free_kbytes_sysctl_handler(ctl_table *table, int
write,
struct file *file, void __user *buffer, size_t *length, loff_t *ppos)
{
proc_dointvec(table, write, file, buffer, length, ppos);
- setup_per_zone_pages_min();
+ if (write)
+ setup_per_zone_pages_min();
return 0;
}
-
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