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authorNick Piggin <npiggin@suse.de>2008-11-19 15:36:33 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2008-11-19 18:49:58 -0800
commit496850e5f5a372029ceb2b35c811770a9bb073b6 (patch)
treec6aa155a0dcf81e967a85dfe2b8142d3b8fa9063 /mm
parentf011c2dae6cffc50ef67d9bd937b488ba5db8913 (diff)
downloadlinux-2.6.34-ux500-496850e5f5a372029ceb2b35c811770a9bb073b6.tar.gz
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>
Diffstat (limited to 'mm')
-rw-r--r--mm/vmalloc.c15
1 files changed, 13 insertions, 2 deletions
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 46aab4dbf61..04f5e320e74 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -522,13 +522,24 @@ static void __purge_vmap_area_lazy(unsigned long *start, unsigned long *end,
}
/*
+ * 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.
*/
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)