From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ob0-f179.google.com (mail-ob0-f179.google.com [209.85.214.179]) by kanga.kvack.org (Postfix) with ESMTP id E67486B0032 for ; Sat, 25 Apr 2015 17:51:44 -0400 (EDT) Received: by obbeb7 with SMTP id eb7so60280429obb.3 for ; Sat, 25 Apr 2015 14:51:44 -0700 (PDT) Received: from userp1040.oracle.com (userp1040.oracle.com. [156.151.31.81]) by mx.google.com with ESMTPS id uv7si10996034obc.93.2015.04.25.14.51.43 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sat, 25 Apr 2015 14:51:44 -0700 (PDT) Message-ID: <553C0C65.6010401@oracle.com> Date: Sat, 25 Apr 2015 17:51:33 -0400 From: Sasha Levin MIME-Version: 1.0 Subject: Re: [PATCH 1/2] mm: free large amount of 0-order pages in workqueue References: <1427839895-16434-1-git-send-email-sasha.levin@oracle.com> <20150331153127.2eb8cc2f04c742dde7a8c96c@linux-foundation.org> <551B222E.4000009@oracle.com> <20150331155455.dd725010cec78112cd549c5b@linux-foundation.org> In-Reply-To: <20150331155455.dd725010cec78112cd549c5b@linux-foundation.org> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Andrew Morton Cc: linux-kernel@vger.kernel.org, mhocko@suse.cz, Mel Gorman , Vlastimil Babka , Johannes Weiner , David Rientjes , Joonsoo Kim , open@kvack.org, list@kvack.org, MEMORY MANAGEMENT On 03/31/2015 06:54 PM, Andrew Morton wrote: >> [ 2896.340953] trinity-c6 R running task 27040 6561 9144 0x10000006 >> > [ 2896.342673] ffff8802e72576a8 ffff8802e7257758 ffffffffabfdd628 003c5e36ef1674fa >> > [ 2896.344267] ffff8801533e1588 ffff8801533e1560 ffff8802d3963778 ffff8802ad220000 >> > [ 2896.345824] ffff8802d3963000 0000000000000000 ffff8802e7250000 ffffed005ce4a002 >> > [ 2896.347286] Call Trace: >> > [ 2896.347784] ? trace_hardirqs_on_thunk (arch/x86/lib/thunk_64.S:42) >> > [ 2896.348977] preempt_schedule_common (./arch/x86/include/asm/preempt.h:77 (discriminator 1) kernel/sched/core.c:2867 (discriminator 1)) >> > [ 2896.350279] preempt_schedule (kernel/sched/core.c:2893) >> > [ 2896.351349] ___preempt_schedule (arch/x86/lib/thunk_64.S:51) >> > [ 2896.353782] __debug_check_no_obj_freed (lib/debugobjects.c:713) >> > [ 2896.360001] debug_check_no_obj_freed (lib/debugobjects.c:727) >> > [ 2896.361574] free_pages_prepare (mm/page_alloc.c:823) >> > [ 2896.362657] free_hot_cold_page (mm/page_alloc.c:1550) >> > [ 2896.363735] free_hot_cold_page_list (mm/page_alloc.c:1596 (discriminator 3)) >> > [ 2896.364846] release_pages (mm/swap.c:935) >> > [ 2896.367979] __pagevec_release (include/linux/pagevec.h:44 mm/swap.c:1013) >> > [ 2896.369149] shmem_undo_range (include/linux/pagevec.h:69 mm/shmem.c:446) >> > [ 2896.377070] shmem_truncate_range (mm/shmem.c:541) >> > [ 2896.378450] shmem_setattr (mm/shmem.c:577) >> > [ 2896.379556] notify_change (fs/attr.c:270) >> > [ 2896.382804] do_truncate (fs/open.c:62) >> > [ 2896.387739] do_sys_ftruncate.constprop.4 (fs/open.c:191) >> > [ 2896.389450] SyS_ftruncate (fs/open.c:199) >> > [ 2896.390879] tracesys_phase2 (arch/x86/kernel/entry_64.S:340) > OK, so shmem_undo_range() is full of cond_resched()s but it's holding > i_mutex for too long. Hugh, fix your junk! Ping on this one? It's causing lockups on all kernels... Thanks, Sasha -- 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