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[PATCH] call mm/page-writeback.c:set_ratelimit() when new pages are hot-added

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ratelimit_pages in page-writeback.c is recalculated (in set_ratelimit())
every time a CPU is hot-added/removed.  But this value is not recalculated
when new pages are hot-added.

This patch fixes that problem by calling set_ratelimit() when new pages
are hot-added.

[akpm@osdl.org: cleanups]
Signed-off-by: Chandra Seetharaman <sekharan@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Chandra Seetharaman 2006-09-29 02:01:25 -07:00 committed by Linus Torvalds
parent 40c99aae23
commit 2d1d43f6a4
3 changed files with 6 additions and 3 deletions
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1
include/linux/writeback.h
View File

@ -117,6 +117,7 @@ int sync_page_range(struct inode *inode, struct address_space *mapping,
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);
void writeback_set_ratelimit(void);
/* pdflush.c */
extern int nr_pdflush_threads; /* Global so it can be exported to sysctl

2
mm/memory_hotplug.c
View File

@ -13,6 +13,7 @@
#include <linux/compiler.h>
#include <linux/module.h>
#include <linux/pagevec.h>
#include <linux/writeback.h>
#include <linux/slab.h>
#include <linux/sysctl.h>
#include <linux/cpu.h>
@ -192,6 +193,7 @@ int online_pages(unsigned long pfn, unsigned long nr_pages)
if (need_zonelists_rebuild)
build_all_zonelists();
vm_total_pages = nr_free_pagecache_pages();
writeback_set_ratelimit();
return 0;
}

6
mm/page-writeback.c
View File

@ -501,7 +501,7 @@ void laptop_sync_completion(void)
* will write six megabyte chunks, max.
*/
static void set_ratelimit(void)
void writeback_set_ratelimit(void)
{
ratelimit_pages = vm_total_pages / (num_online_cpus() * 32);
if (ratelimit_pages < 16)
@ -513,7 +513,7 @@ static void set_ratelimit(void)
static int __cpuinit
ratelimit_handler(struct notifier_block *self, unsigned long u, void *v)
{
set_ratelimit();
writeback_set_ratelimit();
return 0;
}
@ -546,7 +546,7 @@ void __init page_writeback_init(void)
vm_dirty_ratio = 1;
}
mod_timer(&wb_timer, jiffies + dirty_writeback_interval);
set_ratelimit();
writeback_set_ratelimit();
register_cpu_notifier(&ratelimit_nb);
}