From mboxrd@z Thu Jan 1 00:00:00 1970 Received: by ug-out-1314.google.com with SMTP id s2so72584uge for ; Wed, 11 Apr 2007 02:53:49 -0700 (PDT) Message-ID: Date: Wed, 11 Apr 2007 17:53:49 +0800 From: "Zhao Forrest" Subject: Re: Why kmem_cache_free occupy CPU for more than 10 seconds? In-Reply-To: <84144f020704102353r7dcc3538u2e34237d3496630e@mail.gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <84144f020704102353r7dcc3538u2e34237d3496630e@mail.gmail.com> Sender: owner-linux-mm@kvack.org Return-Path: To: Pekka Enberg Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org List-ID: I got some new information: Before soft lockup message is out, we have: [root@nsgsh-dhcp-149 home]# cat /proc/slabinfo |grep buffer_head buffer_head 10927942 10942560 120 32 1 : tunables 32 16 8 : slabdata 341955 341955 6 : globalstat 37602996 11589379 1174373 6 0 1 6918 12166031 1013708 : cpustat 35254590 2350698 13610965 907286 Then after buffer_head is freed, we have: [root@nsgsh-dhcp-149 home]# cat /proc/slabinfo |grep buffer_head buffer_head 9542 36384 120 32 1 : tunables 32 16 8 : slabdata 1137 1137 245 : globalstat 37602996 11589379 1174373 6 0 1 6983 20507478 1708818 : cpustat 35254625 2350704 16027174 1068367 Does this huge number of buffer_head cause the soft lockup? Thanks, Forrest On 4/11/07, Pekka Enberg wrote: > On 4/11/07, Zhao Forrest wrote: > > We're using RHEL5 with kernel version 2.6.18-8.el5. > > When doing a stress test on raw device for about 3-4 hours, we found > > the soft lockup message in dmesg. > > I know we're not reporting the bug on the latest kernel, but does any > > expert know if this is the known issue in old kernel? Or why > > kmem_cache_free occupy CPU for more than 10 seconds? > > Sounds like slab corruption. CONFIG_DEBUG_SLAB should tell you more. > -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org