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[PATCH] call mm/page-writeback.c:set_ratelimit() when new pages are hot-added
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>
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@ -117,6 +117,7 @@ int sync_page_range(struct inode *inode, struct address_space *mapping,
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int sync_page_range_nolock(struct inode *inode, struct address_space *mapping,
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loff_t pos, loff_t count);
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void set_page_dirty_balance(struct page *page);
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void writeback_set_ratelimit(void);
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/* pdflush.c */
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extern int nr_pdflush_threads; /* Global so it can be exported to sysctl
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@ -13,6 +13,7 @@
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#include <linux/compiler.h>
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#include <linux/module.h>
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#include <linux/pagevec.h>
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#include <linux/writeback.h>
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#include <linux/slab.h>
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#include <linux/sysctl.h>
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#include <linux/cpu.h>
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@ -192,6 +193,7 @@ int online_pages(unsigned long pfn, unsigned long nr_pages)
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if (need_zonelists_rebuild)
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build_all_zonelists();
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vm_total_pages = nr_free_pagecache_pages();
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writeback_set_ratelimit();
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return 0;
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}
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@ -501,7 +501,7 @@ void laptop_sync_completion(void)
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* will write six megabyte chunks, max.
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*/
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static void set_ratelimit(void)
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void writeback_set_ratelimit(void)
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{
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ratelimit_pages = vm_total_pages / (num_online_cpus() * 32);
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if (ratelimit_pages < 16)
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@ -513,7 +513,7 @@ static void set_ratelimit(void)
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static int __cpuinit
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ratelimit_handler(struct notifier_block *self, unsigned long u, void *v)
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{
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set_ratelimit();
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writeback_set_ratelimit();
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return 0;
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}
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@ -546,7 +546,7 @@ void __init page_writeback_init(void)
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vm_dirty_ratio = 1;
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}
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mod_timer(&wb_timer, jiffies + dirty_writeback_interval);
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set_ratelimit();
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writeback_set_ratelimit();
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register_cpu_notifier(&ratelimit_nb);
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}
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