The patch titled
throttle writers of shared mappings
has been added to the -mm tree. Its filename is
throttle-writers-of-shared-mappings.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
From: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Now that we can detect writers of shared mappings, throttle them. Avoids OOM
by surprise.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: Nick Piggin <nickpiggin@xxxxxxxxxxxx>
Cc: Hugh Dickins <hugh@xxxxxxxxxxx>
Cc: Christoph Lameter <clameter@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
mm/memory.c | 7 +++++++
1 files changed, 7 insertions(+)
diff -puN mm/memory.c~throttle-writers-of-shared-mappings mm/memory.c
--- devel/mm/memory.c~throttle-writers-of-shared-mappings 2006-05-11 02:21:57.000000000 -0700
+++ devel-akpm/mm/memory.c 2006-05-11 02:21:57.000000000 -0700
@@ -49,6 +49,7 @@
#include <linux/module.h>
#include <linux/init.h>
#include <linux/backing-dev.h>
+#include <linux/writeback.h>
#include <asm/pgalloc.h>
#include <asm/uaccess.h>
@@ -2163,8 +2164,11 @@ retry:
unlock:
pte_unmap_unlock(page_table, ptl);
if (dirty_page) {
+ struct address_space *mapping = page_mapping(dirty_page);
set_page_dirty(dirty_page);
put_page(dirty_page);
+ if (mapping)
+ balance_dirty_pages_ratelimited_nr(mapping, 1);
}
return ret;
oom:
@@ -2284,8 +2288,11 @@ static inline int handle_pte_fault(struc
unlock:
pte_unmap_unlock(pte, ptl);
if (dirty_page) {
+ struct address_space *mapping = page_mapping(dirty_page);
set_page_dirty(dirty_page);
put_page(dirty_page);
+ if (mapping)
+ balance_dirty_pages_ratelimited_nr(mapping, 1);
}
return VM_FAULT_MINOR;
}
_
Patches currently in -mm which might be from a.p.zijlstra@xxxxxxxxx are
buglet-in-radix_tree_tag_set.patch
tracking-dirty-pages-in-shared-mappings-v4.patch
tracking-dirty-pages-in-shared-mappings-v4-fix.patch
throttle-writers-of-shared-mappings.patch
throttle-writers-of-shared-mappings-tidy.patch
optimize-follow_pages.patch
-
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