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mm: vmalloc failure flush fix 

An initial vmalloc failure should start off a synchronous flush of lazy
areas, in case someone is in progress flushing them already, which could
cause us to return an allocation failure even if there is plenty of KVA
free.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Nick Piggin 2008-11-19 15:36:33 -08:00 committed by Linus Torvalds
parent f011c2dae6
commit 496850e5f5
1 changed files with 13 additions and 2 deletions
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15
mm/vmalloc.c
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@ -521,6 +521,17 @@ static void __purge_vmap_area_lazy(unsigned long *start, unsigned long *end,
spin_unlock(&purge_lock);
}
/*
* Kick off a purge of the outstanding lazy areas. Don't bother if somebody
* is already purging.
*/
static void try_purge_vmap_area_lazy(void)
{
unsigned long start = ULONG_MAX, end = 0;
__purge_vmap_area_lazy(&start, &end, 0, 0);
}
/*
* Kick off a purge of the outstanding lazy areas.
*/
@ -528,7 +539,7 @@ static void purge_vmap_area_lazy(void)
{
unsigned long start = ULONG_MAX, end = 0;
__purge_vmap_area_lazy(&start, &end, 0, 0);
__purge_vmap_area_lazy(&start, &end, 1, 0);
}
/*
@ -539,7 +550,7 @@ static void free_unmap_vmap_area(struct vmap_area *va)
va->flags |= VM_LAZY_FREE;
atomic_add((va->va_end - va->va_start) >> PAGE_SHIFT, &vmap_lazy_nr);
if (unlikely(atomic_read(&vmap_lazy_nr) > lazy_max_pages()))
purge_vmap_area_lazy();
try_purge_vmap_area_lazy();
}
static struct vmap_area *find_vmap_area(unsigned long addr)