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mm/pm: force GFP_NOIO during suspend/hibernation and resume

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There are quite a few GFP_KERNEL memory allocations made during
suspend/hibernation and resume that may cause the system to hang, because
the I/O operations they depend on cannot be completed due to the
underlying devices being suspended.

Avoid this problem by clearing the __GFP_IO and __GFP_FS bits in
gfp_allowed_mask before suspend/hibernation and restoring the original
values of these bits in gfp_allowed_mask durig the subsequent resume.

[[email protected]: fix CONFIG_PM=n linkage]
Signed-off-by: Rafael J. Wysocki <[email protected]>
Reported-by: Maxim Levitsky <[email protected]>
Cc: Sebastian Ott <[email protected]>
Cc: Benjamin Herrenschmidt <[email protected]>
Cc: KOSAKI Motohiro <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Rafael J. Wysocki 2010-03-05 13:42:13 -08:00 • committed by Linus Torvalds
commit 452aa6999e
5 changed files with 41 additions and 5 deletions
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25
mm/page_alloc.c
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@ -76,6 +76,31 @@ unsigned long totalreserve_pages __read_mostly;
int percpu_pagelist_fraction;
gfp_t gfp_allowed_mask __read_mostly = GFP_BOOT_MASK;
#ifdef CONFIG_PM_SLEEP
/*
* The following functions are used by the suspend/hibernate code to temporarily
* change gfp_allowed_mask in order to avoid using I/O during memory allocations
* while devices are suspended. To avoid races with the suspend/hibernate code,
* they should always be called with pm_mutex held (gfp_allowed_mask also should
* only be modified with pm_mutex held, unless the suspend/hibernate code is
* guaranteed not to run in parallel with that modification).
*/
void set_gfp_allowed_mask(gfp_t mask)
{
WARN_ON(!mutex_is_locked(&pm_mutex));
gfp_allowed_mask = mask;
}
gfp_t clear_gfp_allowed_mask(gfp_t mask)
{
gfp_t ret = gfp_allowed_mask;
WARN_ON(!mutex_is_locked(&pm_mutex));
gfp_allowed_mask &= ~mask;
return ret;
}
#endif /* CONFIG_PM_SLEEP */
#ifdef CONFIG_HUGETLB_PAGE_SIZE_VARIABLE
int pageblock_order __read_mostly;
#endif