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mm/page-writeback: highmem_is_dirtyable option

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Add vm.highmem_is_dirtyable toggle

A 32 bit machine with HIGHMEM64 enabled running DCC has an MMAPed file of
approximately 2Gb size which contains a hash format that is written
randomly by the dbclean process.  On 2.6.16 this process took a few
minutes.  With lowmem only accounting of dirty ratios, this takes about 12
hours of 100% disk IO, all random writes.

Include a toggle in /proc/sys/vm/highmem_is_dirtyable which can be set to 1 to
add the highmem back to the total available memory count.

[[email protected]: Fix the CONFIG_DETECT_SOFTLOCKUP=y build]
Signed-off-by: Bron Gondwana <[email protected]>
Cc: Ethan Solomita <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: WU Fengguang <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Bron Gondwana 2008-02-04 22:29:20 -08:00 • committed by Linus Torvalds
commit 195cf453d2
5 changed files with 47 additions and 5 deletions
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11
mm/page-writeback.c
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@ -68,6 +68,12 @@ static inline long sync_writeback_pages(void)
*/
int dirty_background_ratio = 5;
/*
* free highmem will not be subtracted from the total free memory
* for calculating free ratios if vm_highmem_is_dirtyable is true
*/
int vm_highmem_is_dirtyable;
/*
* The generator of dirty data starts writeback at this percentage
*/
@ -287,7 +293,10 @@ static unsigned long determine_dirtyable_memory(void)
x = global_page_state(NR_FREE_PAGES)
+ global_page_state(NR_INACTIVE)
+ global_page_state(NR_ACTIVE);
x -= highmem_dirtyable_memory(x);
if (!vm_highmem_is_dirtyable)
x -= highmem_dirtyable_memory(x);
return x + 1; /* Ensure that we never return 0 */
}