linux-kernel - Re: frequent lockups in 3.18rc4

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Message-ID: <02fc01d018dd$0fc01530$2f403f90$@alibaba-inc.com>
Date:	Tue, 16 Dec 2014 11:04:51 +0800
From:	"Hillf Danton" <hillf.zj@...baba-inc.com>
To:	"Linus Torvalds" <torvalds@...ux-foundation.org>
Cc:	"Dave Jones" <davej@...hat.com>,
	"Mike Galbraith" <mgalbraith@...e.de>,
	"Ingo Molnar" <mingo@...hat.com>,
	"Peter Zijlstra" <peterz@...radead.org>,
	"'Chris Mason'" <clm@...com>,
	"linux-kernel" <linux-kernel@...r.kernel.org>
Subject: Re: frequent lockups in 3.18rc4

> 
> But me not seeing any other bug clearly doesn't mean it doesn't exist.
> 
Perhaps  we can easy the zap loop if it is busy.

thanks
Hillf

--- a/mm/memory.c	Tue Dec 16 10:38:03 2014
+++ b/mm/memory.c	Tue Dec 16 10:42:07 2014
@@ -1212,8 +1212,10 @@ again:
 		force_flush = 0;
 		tlb_flush_mmu_free(tlb);
 
-		if (addr != end)
+		if (addr != end) {
+			cond_resched();
 			goto again;
+		}
 	}
 
 	return addr;
--


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