From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail203.messagelabs.com (mail203.messagelabs.com [216.82.254.243]) by kanga.kvack.org (Postfix) with SMTP id 0D4F96B00A7 for ; Tue, 12 May 2009 20:01:21 -0400 (EDT) Received: from m6.gw.fujitsu.co.jp ([10.0.50.76]) by fgwmail5.fujitsu.co.jp (Fujitsu Gateway) with ESMTP id n4D01KGJ020963 for (envelope-from kamezawa.hiroyu@jp.fujitsu.com); Wed, 13 May 2009 09:01:21 +0900 Received: from smail (m6 [127.0.0.1]) by outgoing.m6.gw.fujitsu.co.jp (Postfix) with ESMTP id A746545DE52 for ; Wed, 13 May 2009 09:01:20 +0900 (JST) Received: from s6.gw.fujitsu.co.jp (s6.gw.fujitsu.co.jp [10.0.50.96]) by m6.gw.fujitsu.co.jp (Postfix) with ESMTP id 7C57D45DD72 for ; Wed, 13 May 2009 09:01:20 +0900 (JST) Received: from s6.gw.fujitsu.co.jp (localhost.localdomain [127.0.0.1]) by s6.gw.fujitsu.co.jp (Postfix) with ESMTP id 2FFE6E38008 for ; Wed, 13 May 2009 09:01:20 +0900 (JST) Received: from m108.s.css.fujitsu.com (m108.s.css.fujitsu.com [10.249.87.108]) by s6.gw.fujitsu.co.jp (Postfix) with ESMTP id CCCACE38002 for ; Wed, 13 May 2009 09:01:19 +0900 (JST) Date: Wed, 13 May 2009 08:59:49 +0900 From: KAMEZAWA Hiroyuki Subject: Re: [PATCH][BUGFIX] memcg: fix for deadlock between lock_page_cgroup and mapping tree_lock Message-Id: <20090513085949.3c4b7b97.kamezawa.hiroyu@jp.fujitsu.com> In-Reply-To: <20090512195823.15c5cb80.d-nishimura@mtf.biglobe.ne.jp> References: <20090512104401.28edc0a8.kamezawa.hiroyu@jp.fujitsu.com> <20090512140648.0974cb10.nishimura@mxp.nes.nec.co.jp> <20090512160901.8a6c5f64.kamezawa.hiroyu@jp.fujitsu.com> <20090512170007.ad7f5c7b.nishimura@mxp.nes.nec.co.jp> <20090512171356.3d3a7554.kamezawa.hiroyu@jp.fujitsu.com> <20090512195823.15c5cb80.d-nishimura@mtf.biglobe.ne.jp> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org To: nishimura@mxp.nes.nec.co.jp Cc: Daisuke Nishimura , "linux-mm@kvack.org" , "balbir@linux.vnet.ibm.com" , "akpm@linux-foundation.org" , mingo@elte.hu, "linux-kernel@vger.kernel.org" List-ID: On Tue, 12 May 2009 19:58:23 +0900 Daisuke Nishimura wrote: > On Tue, 12 May 2009 17:13:56 +0900 > KAMEZAWA Hiroyuki wrote: > > > On Tue, 12 May 2009 17:00:07 +0900 > > Daisuke Nishimura wrote: > > > hmm, I see. > > > cache_charge is outside of tree_lock, so moving uncharge would make sense. > > > IMHO, we should make the period of spinlock as small as possible, > > > and charge/uncharge of pagecache/swapcache is protected by page lock, not tree_lock. > > > > > How about this ? > Looks good conceptually, but it cannot be built :) > > It needs a fix like this. > Passed build test with enabling/disabling both CONFIG_MEM_RES_CTLR > and CONFIG_SWAP. > ok, will update. can I add you Signed-off-by on the patch ? Thanks, -Kame > === > include/linux/swap.h | 5 +++++ > mm/memcontrol.c | 4 +++- > mm/swap_state.c | 4 +--- > mm/vmscan.c | 2 +- > 4 files changed, 10 insertions(+), 5 deletions(-) > > diff --git a/include/linux/swap.h b/include/linux/swap.h > index caf0767..6ea541d 100644 > --- a/include/linux/swap.h > +++ b/include/linux/swap.h > @@ -431,6 +431,11 @@ static inline swp_entry_t get_swap_page(void) > #define has_swap_token(x) 0 > #define disable_swap_token() do { } while(0) > > +static inline void > +mem_cgroup_uncharge_swapcache(struct page *page, swp_entry_t ent) > +{ > +} > + > #endif /* CONFIG_SWAP */ > #endif /* __KERNEL__*/ > #endif /* _LINUX_SWAP_H */ > diff --git a/mm/memcontrol.c b/mm/memcontrol.c > index 0c9c1ad..89523cf 100644 > --- a/mm/memcontrol.c > +++ b/mm/memcontrol.c > @@ -1488,8 +1488,9 @@ void mem_cgroup_uncharge_cache_page(struct page *page) > __mem_cgroup_uncharge_common(page, MEM_CGROUP_CHARGE_TYPE_CACHE); > } > > +#ifdef CONFIG_SWAP > /* > - * called from __delete_from_swap_cache() and drop "page" account. > + * called after __delete_from_swap_cache() and drop "page" account. > * memcg information is recorded to swap_cgroup of "ent" > */ > void mem_cgroup_uncharge_swapcache(struct page *page, swp_entry_t ent) > @@ -1506,6 +1507,7 @@ void mem_cgroup_uncharge_swapcache(struct page *page, swp_entry_t ent) > if (memcg) > css_put(&memcg->css); > } > +#endif > > #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP > /* > diff --git a/mm/swap_state.c b/mm/swap_state.c > index 87f10d4..7624c89 100644 > --- a/mm/swap_state.c > +++ b/mm/swap_state.c > @@ -109,8 +109,6 @@ int add_to_swap_cache(struct page *page, swp_entry_t entry, gfp_t gfp_mask) > */ > void __delete_from_swap_cache(struct page *page) > { > - swp_entry_t ent = {.val = page_private(page)}; > - > VM_BUG_ON(!PageLocked(page)); > VM_BUG_ON(!PageSwapCache(page)); > VM_BUG_ON(PageWriteback(page)); > @@ -190,7 +188,7 @@ void delete_from_swap_cache(struct page *page) > __delete_from_swap_cache(page); > spin_unlock_irq(&swapper_space.tree_lock); > > - mem_cgroup_uncharge_swapcache(page, ent); > + mem_cgroup_uncharge_swapcache(page, entry); > swap_free(entry); > page_cache_release(page); > } > diff --git a/mm/vmscan.c b/mm/vmscan.c > index 6c5988d..a7d7a06 100644 > --- a/mm/vmscan.c > +++ b/mm/vmscan.c > @@ -470,7 +470,7 @@ static int __remove_mapping(struct address_space *mapping, struct page *page) > swp_entry_t swap = { .val = page_private(page) }; > __delete_from_swap_cache(page); > spin_unlock_irq(&mapping->tree_lock); > - mem_cgroup_uncharge_swapcache(page); > + mem_cgroup_uncharge_swapcache(page, swap); > swap_free(swap); > } else { > __remove_from_page_cache(page); > === > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ > -- 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