From: Eric Dumazet <edumazet@google.com>
Date: Thu, 26 Jun 2014 00:42:42 +0000 (+1000)
Subject: mm/vmalloc.c: add a schedule point to vmalloc()
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=e774d946ea9f7f01bf13d45d7ef76a854fc60d12;p=karo-tx-linux.git

mm/vmalloc.c: add a schedule point to vmalloc()

It is not uncommon on busy servers to get stuck hundred of ms in vmalloc()
calls (like file descriptor expansions).

Add a cond_resched() to __vmalloc_area_node() to be gentle to
other tasks.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Hugh Dickins <hughd@google.com>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index fdbb116ee669..a7c779d3ffa6 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -1602,6 +1602,7 @@ static void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask,
 			goto fail;
 		}
 		area->pages[i] = page;
+		cond_resched();
 	}
 
 	if (map_vm_area(area, prot, &pages))