From 885036d32f5d3c427c3e2b385b5a5503805e3e52 Mon Sep 17 00:00:00 2001
From: Kirill Korotaev <dev@sw.ru>
Date: Sun, 13 Nov 2005 16:06:41 -0800
Subject: [PATCH] [PATCH] mm: __GFP_NOFAIL fix
In __alloc_pages():
if ((p->flags & (PF_MEMALLOC | PF_MEMDIE)) && !in_interrupt()) {
/* go through the zonelist yet again, ignoring mins */
for (i = 0; zones[i] != NULL; i++) {
struct zone *z = zones[i];
page = buffered_rmqueue(z, order, gfp_mask);
if (page) {
zone_statistics(zonelist, z);
goto got_pg;
}
}
goto nopage; <<<< HERE!!! FAIL...
}
kswapd (which has PF_MEMALLOC flag) can fail to allocate memory even when
it allocates it with __GFP_NOFAIL flag.
Signed-Off-By: Pavel Emelianov <xemul@sw.ru>
Signed-Off-By: Denis Lunev <den@sw.ru>
Signed-Off-By: Kirill Korotaev <dev@sw.ru>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---
mm/page_alloc.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 987225bdd661c..b37dc0f78d077 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -895,6 +895,7 @@ __alloc_pages(gfp_t gfp_mask, unsigned int order,
if (((p->flags & PF_MEMALLOC) || unlikely(test_thread_flag(TIF_MEMDIE)))
&& !in_interrupt()) {
if (!(gfp_mask & __GFP_NOMEMALLOC)) {
+nofail_alloc:
/* go through the zonelist yet again, ignoring mins */
for (i = 0; (z = zones[i]) != NULL; i++) {
if (!cpuset_zone_allowed(z, gfp_mask))
@@ -903,6 +904,10 @@ __alloc_pages(gfp_t gfp_mask, unsigned int order,
if (page)
goto got_pg;
}
+ if (gfp_mask & __GFP_NOFAIL) {
+ blk_congestion_wait(WRITE, HZ/50);
+ goto nofail_alloc;
+ }
}
goto nopage;
}
--
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