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[PATCH] mm: balance dirty pages

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Now that we can detect writers of shared mappings, throttle them.  Avoids OOM
by surprise.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Peter Zijlstra 2006-09-25 23:30:58 -07:00 committed by Linus Torvalds
parent d08b3851da
commit edc79b2a46
3 changed files with 14 additions and 2 deletions
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1
include/linux/writeback.h
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@ -116,6 +116,7 @@ int sync_page_range(struct inode *inode, struct address_space *mapping,
loff_t pos, loff_t count);
int sync_page_range_nolock(struct inode *inode, struct address_space *mapping,
loff_t pos, loff_t count);
void set_page_dirty_balance(struct page *page);
/* pdflush.c */
extern int nr_pdflush_threads; /* Global so it can be exported to sysctl

5
mm/memory.c
View File

@ -49,6 +49,7 @@
#include <linux/module.h>
#include <linux/delayacct.h>
#include <linux/init.h>
#include <linux/writeback.h>
#include <asm/pgalloc.h>
#include <asm/uaccess.h>
@ -1571,7 +1572,7 @@ static int do_wp_page(struct mm_struct *mm, struct vm_area_struct *vma,
unlock:
pte_unmap_unlock(page_table, ptl);
if (dirty_page) {
set_page_dirty(dirty_page);
set_page_dirty_balance(dirty_page);
put_page(dirty_page);
}
return ret;
@ -2218,7 +2219,7 @@ static int do_no_page(struct mm_struct *mm, struct vm_area_struct *vma,
unlock:
pte_unmap_unlock(page_table, ptl);
if (dirty_page) {
set_page_dirty(dirty_page);
set_page_dirty_balance(dirty_page);
put_page(dirty_page);
}
return ret;

10
mm/page-writeback.c
View File

@ -244,6 +244,16 @@ static void balance_dirty_pages(struct address_space *mapping)
pdflush_operation(background_writeout, 0);
}
void set_page_dirty_balance(struct page *page)
{
if (set_page_dirty(page)) {
struct address_space *mapping = page_mapping(page);
if (mapping)
balance_dirty_pages_ratelimited(mapping);
}
}
/**
* balance_dirty_pages_ratelimited_nr - balance dirty memory state
* @mapping: address_space which was dirtied