From: Hugh Dickins <hughd@google.com> To: Mel Gorman <mgorman@suse.de> Cc: Minchan Kim <minchan@kernel.org>, Andrew Morton <akpm@linux-foundation.org>, Andrea Arcangeli <aarcange@redhat.com>, Minchan Kim <minchan.kim@gmail.com>, Dave Jones <davej@redhat.com>, Jan Kara <jack@suse.cz>, Andy Isaacson <adi@hexapodia.org>, Johannes Weiner <jweiner@redhat.com>, Rik van Riel <riel@redhat.com>, Nai Xia <nai.xia@gmail.com>, Linux-MM <linux-mm@kvack.org>, LKML <linux-kernel@vger.kernel.org> Subject: Re: [PATCH 11/11] mm: Isolate pages for immediate reclaim on their own LRU Date: Fri, 23 Dec 2011 11:08:19 -0800 (PST) [thread overview] Message-ID: <alpine.LSU.2.00.1112231039030.17640@eggly.anvils> (raw) In-Reply-To: <20111220095544.GP3487@suse.de> Sorry, Mel, I've had to revert this patch (and its two little children) from my 3.2.0-rc6-next-20111222 testing: you really do need a page flag (or substitute) for your "immediate" lru. How else can a del_page_from_lru[_list]() know whether to decrement the count of the immediate or the inactive list? page_lru() says to decrement the count of the inactive list, so in due course that wraps to a gigantic number, and then page reclaim livelocks trying to wring pages out of an empty list. It's the memcg case I've been hitting, but presumably the same happens with global counts. There is another such accounting bug in -next, been there longer and not so easy to hit: I'm fairly sure it will turn out to be memcg misaccounting a THPage somewhere, I'll have a look around shortly. Hugh p.s. Immediate? Isn't that an odd name for a list of pages which are not immediately freeable? Maybe Rik's launder/laundry name would be better: pages which are currently being cleaned.
WARNING: multiple messages have this Message-ID (diff)
From: Hugh Dickins <hughd@google.com> To: Mel Gorman <mgorman@suse.de> Cc: Minchan Kim <minchan@kernel.org>, Andrew Morton <akpm@linux-foundation.org>, Andrea Arcangeli <aarcange@redhat.com>, Minchan Kim <minchan.kim@gmail.com>, Dave Jones <davej@redhat.com>, Jan Kara <jack@suse.cz>, Andy Isaacson <adi@hexapodia.org>, Johannes Weiner <jweiner@redhat.com>, Rik van Riel <riel@redhat.com>, Nai Xia <nai.xia@gmail.com>, Linux-MM <linux-mm@kvack.org>, LKML <linux-kernel@vger.kernel.org> Subject: Re: [PATCH 11/11] mm: Isolate pages for immediate reclaim on their own LRU Date: Fri, 23 Dec 2011 11:08:19 -0800 (PST) [thread overview] Message-ID: <alpine.LSU.2.00.1112231039030.17640@eggly.anvils> (raw) In-Reply-To: <20111220095544.GP3487@suse.de> Sorry, Mel, I've had to revert this patch (and its two little children) from my 3.2.0-rc6-next-20111222 testing: you really do need a page flag (or substitute) for your "immediate" lru. How else can a del_page_from_lru[_list]() know whether to decrement the count of the immediate or the inactive list? page_lru() says to decrement the count of the inactive list, so in due course that wraps to a gigantic number, and then page reclaim livelocks trying to wring pages out of an empty list. It's the memcg case I've been hitting, but presumably the same happens with global counts. There is another such accounting bug in -next, been there longer and not so easy to hit: I'm fairly sure it will turn out to be memcg misaccounting a THPage somewhere, I'll have a look around shortly. Hugh p.s. Immediate? Isn't that an odd name for a list of pages which are not immediately freeable? Maybe Rik's launder/laundry name would be better: pages which are currently being cleaned. -- 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/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2011-12-23 19:08 UTC|newest] Thread overview: 100+ messages / expand[flat|nested] mbox.gz Atom feed top 2011-12-14 15:41 [PATCH 0/11] Reduce compaction-related stalls and improve asynchronous migration of dirty pages v6 Mel Gorman 2011-12-14 15:41 ` Mel Gorman 2011-12-14 15:41 ` [PATCH 01/11] mm: compaction: Allow compaction to isolate dirty pages Mel Gorman 2011-12-14 15:41 ` Mel Gorman 2011-12-14 15:41 ` [PATCH 02/11] mm: compaction: Use synchronous compaction for /proc/sys/vm/compact_memory Mel Gorman 2011-12-14 15:41 ` Mel Gorman 2011-12-14 15:41 ` [PATCH 03/11] mm: vmscan: Check if we isolated a compound page during lumpy scan Mel Gorman 2011-12-14 15:41 ` Mel Gorman 2011-12-15 23:21 ` Rik van Riel 2011-12-15 23:21 ` Rik van Riel 2011-12-14 15:41 ` [PATCH 04/11] mm: vmscan: Do not OOM if aborting reclaim to start compaction Mel Gorman 2011-12-14 15:41 ` Mel Gorman 2011-12-15 23:36 ` Rik van Riel 2011-12-15 23:36 ` Rik van Riel 2011-12-14 15:41 ` [PATCH 05/11] mm: compaction: Determine if dirty pages can be migrated without blocking within ->migratepage Mel Gorman 2011-12-14 15:41 ` Mel Gorman 2011-12-16 3:32 ` Rik van Riel 2011-12-16 3:32 ` Rik van Riel 2011-12-16 23:20 ` Andrew Morton 2011-12-16 23:20 ` Andrew Morton 2011-12-17 3:03 ` Nai Xia 2011-12-17 3:03 ` Nai Xia 2011-12-17 3:26 ` Andrew Morton 2011-12-17 3:26 ` Andrew Morton 2011-12-19 11:05 ` Mel Gorman 2011-12-19 11:05 ` Mel Gorman 2011-12-19 13:12 ` nai.xia 2011-12-19 13:12 ` nai.xia 2011-12-14 15:41 ` [PATCH 06/11] mm: compaction: make isolate_lru_page() filter-aware again Mel Gorman 2011-12-14 15:41 ` Mel Gorman 2011-12-16 3:34 ` Rik van Riel 2011-12-16 3:34 ` Rik van Riel 2011-12-18 1:53 ` Minchan Kim 2011-12-18 1:53 ` Minchan Kim 2011-12-14 15:41 ` [PATCH 07/11] mm: page allocator: Do not call direct reclaim for THP allocations while compaction is deferred Mel Gorman 2011-12-14 15:41 ` Mel Gorman 2011-12-16 4:10 ` Rik van Riel 2011-12-16 4:10 ` Rik van Riel 2011-12-14 15:41 ` [PATCH 08/11] mm: compaction: Introduce sync-light migration for use by compaction Mel Gorman 2011-12-14 15:41 ` Mel Gorman 2011-12-16 4:31 ` Rik van Riel 2011-12-16 4:31 ` Rik van Riel 2011-12-18 2:05 ` Minchan Kim 2011-12-18 2:05 ` Minchan Kim 2011-12-19 11:45 ` Mel Gorman 2011-12-19 11:45 ` Mel Gorman 2011-12-20 7:18 ` Minchan Kim 2011-12-20 7:18 ` Minchan Kim 2012-01-13 21:25 ` Andrew Morton 2012-01-13 21:25 ` Andrew Morton 2012-01-16 11:33 ` Mel Gorman 2012-01-16 11:33 ` Mel Gorman 2011-12-14 15:41 ` [PATCH 09/11] mm: vmscan: When reclaiming for compaction, ensure there are sufficient free pages available Mel Gorman 2011-12-14 15:41 ` Mel Gorman 2011-12-16 4:35 ` Rik van Riel 2011-12-16 4:35 ` Rik van Riel 2011-12-14 15:41 ` [PATCH 10/11] mm: vmscan: Check if reclaim should really abort even if compaction_ready() is true for one zone Mel Gorman 2011-12-14 15:41 ` Mel Gorman 2011-12-16 4:38 ` Rik van Riel 2011-12-16 4:38 ` Rik van Riel 2011-12-16 11:29 ` Mel Gorman 2011-12-16 11:29 ` Mel Gorman 2011-12-14 15:41 ` [PATCH 11/11] mm: Isolate pages for immediate reclaim on their own LRU Mel Gorman 2011-12-14 15:41 ` Mel Gorman 2011-12-16 4:47 ` Rik van Riel 2011-12-16 4:47 ` Rik van Riel 2011-12-16 12:26 ` Mel Gorman 2011-12-16 12:26 ` Mel Gorman 2011-12-16 15:17 ` Johannes Weiner 2011-12-16 15:17 ` Johannes Weiner 2011-12-16 16:07 ` Mel Gorman 2011-12-16 16:07 ` Mel Gorman 2011-12-19 16:14 ` Johannes Weiner 2011-12-19 16:14 ` Johannes Weiner 2011-12-17 16:08 ` Minchan Kim 2011-12-17 16:08 ` Minchan Kim 2011-12-19 13:26 ` Mel Gorman 2011-12-19 13:26 ` Mel Gorman 2011-12-20 7:10 ` Minchan Kim 2011-12-20 7:10 ` Minchan Kim 2011-12-20 9:55 ` Mel Gorman 2011-12-20 9:55 ` Mel Gorman 2011-12-23 19:08 ` Hugh Dickins [this message] 2011-12-23 19:08 ` Hugh Dickins 2011-12-29 16:59 ` Mel Gorman 2011-12-29 16:59 ` Mel Gorman 2011-12-29 19:31 ` Rik van Riel 2011-12-29 19:31 ` Rik van Riel 2011-12-30 11:27 ` Mel Gorman 2011-12-30 11:27 ` Mel Gorman 2011-12-16 22:56 ` [PATCH 0/11] Reduce compaction-related stalls and improve asynchronous migration of dirty pages v6 Andrew Morton 2011-12-16 22:56 ` Andrew Morton 2011-12-19 14:40 ` Mel Gorman 2011-12-19 14:40 ` Mel Gorman 2011-12-16 23:37 ` Andrew Morton 2011-12-16 23:37 ` Andrew Morton 2011-12-19 14:20 ` Mel Gorman 2011-12-19 14:20 ` Mel Gorman -- strict thread matches above, loose matches on Subject: below -- 2011-12-01 17:36 [PATCH 0/11] Reduce compaction-related stalls and improve asynchronous migration of dirty pages v5 Mel Gorman 2011-12-01 17:36 ` [PATCH 11/11] mm: Isolate pages for immediate reclaim on their own LRU Mel Gorman 2011-12-01 17:36 ` Mel Gorman
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