From: Andrew Morton <akpm@linux-foundation.org> To: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: "linux-mm@kvack.org" <linux-mm@kvack.org>, Linux Kernel <linux-kernel@vger.kernel.org>, "cgroups@vger.kernel.org" <cgroups@vger.kernel.org>, Hugh Dickins <hughd@google.com>, "n-horiguchi@ah.jp.nec.com" <n-horiguchi@ah.jp.nec.com>, Johannes Weiner <hannes@cmpxchg.org>, Michal Hocko <mhocko@suse.cz>, Glauber Costa <glommer@parallels.com> Subject: Re: [PATCH] memcg: change behavior of moving charges at task move Date: Thu, 22 Mar 2012 17:30:00 -0700 [thread overview] Message-ID: <20120322173000.f078a43f.akpm@linux-foundation.org> (raw) In-Reply-To: <4F6BC166.80407@jp.fujitsu.com> On Fri, 23 Mar 2012 09:18:46 +0900 KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> wrote: > >> +#ifdef CONFIG_SWAP > >> + /* > >> + * Avoid lookup_swap_cache() not to update statistics. > >> + */ > > > > I don't understand this comment - what is it trying to tell us? > > > > > High Dickins advised me to use find_get_page() rather than lookup_swap_cache() > because lookup_swap_cache() has some statistics with swap. ah. --- a/mm/memcontrol.c~memcg-change-behavior-of-moving-charges-at-task-move-fix +++ a/mm/memcontrol.c @@ -5137,7 +5137,8 @@ static struct page *mc_handle_swap_pte(s return NULL; #ifdef CONFIG_SWAP /* - * Avoid lookup_swap_cache() not to update statistics. + * Use find_get_page() rather than lookup_swap_cache() because the + * latter alters statistics. */ page = find_get_page(&swapper_space, ent.val); #endif > >> + page = find_get_page(&swapper_space, ent.val); > > > > The code won't even compile if CONFIG_SWAP=n? > > > > mm/built-in.o: In function `mc_handle_swap_pte': > /home/kamezawa/Kernel/next/linux/mm/memcontrol.c:5172: undefined reference to `swapper_space' > make: *** [.tmp_vmlinux1] Error 1 > > Ah...but I think this function (mc_handle_swap_pte) itself should be under CONFIG_SWAP. > I'll post v2. Confused. The new reference to swapper_space is already inside #ifdef CONFIG_SWAP.
WARNING: multiple messages have this Message-ID (diff)
From: Andrew Morton <akpm@linux-foundation.org> To: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: "linux-mm@kvack.org" <linux-mm@kvack.org>, Linux Kernel <linux-kernel@vger.kernel.org>, "cgroups@vger.kernel.org" <cgroups@vger.kernel.org>, Hugh Dickins <hughd@google.com>, "n-horiguchi@ah.jp.nec.com" <n-horiguchi@ah.jp.nec.com>, Johannes Weiner <hannes@cmpxchg.org>, Michal Hocko <mhocko@suse.cz>, Glauber Costa <glommer@parallels.com> Subject: Re: [PATCH] memcg: change behavior of moving charges at task move Date: Thu, 22 Mar 2012 17:30:00 -0700 [thread overview] Message-ID: <20120322173000.f078a43f.akpm@linux-foundation.org> (raw) In-Reply-To: <4F6BC166.80407@jp.fujitsu.com> On Fri, 23 Mar 2012 09:18:46 +0900 KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> wrote: > >> +#ifdef CONFIG_SWAP > >> + /* > >> + * Avoid lookup_swap_cache() not to update statistics. > >> + */ > > > > I don't understand this comment - what is it trying to tell us? > > > > > High Dickins advised me to use find_get_page() rather than lookup_swap_cache() > because lookup_swap_cache() has some statistics with swap. ah. --- a/mm/memcontrol.c~memcg-change-behavior-of-moving-charges-at-task-move-fix +++ a/mm/memcontrol.c @@ -5137,7 +5137,8 @@ static struct page *mc_handle_swap_pte(s return NULL; #ifdef CONFIG_SWAP /* - * Avoid lookup_swap_cache() not to update statistics. + * Use find_get_page() rather than lookup_swap_cache() because the + * latter alters statistics. */ page = find_get_page(&swapper_space, ent.val); #endif > >> + page = find_get_page(&swapper_space, ent.val); > > > > The code won't even compile if CONFIG_SWAP=n? > > > > mm/built-in.o: In function `mc_handle_swap_pte': > /home/kamezawa/Kernel/next/linux/mm/memcontrol.c:5172: undefined reference to `swapper_space' > make: *** [.tmp_vmlinux1] Error 1 > > Ah...but I think this function (mc_handle_swap_pte) itself should be under CONFIG_SWAP. > I'll post v2. Confused. The new reference to swapper_space is already inside #ifdef CONFIG_SWAP. -- 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:[~2012-03-23 0:26 UTC|newest] Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top 2012-03-21 9:52 [PATCH] memcg: change behavior of moving charges at task move KAMEZAWA Hiroyuki 2012-03-21 9:52 ` KAMEZAWA Hiroyuki 2012-03-22 15:17 ` Naoya Horiguchi 2012-03-22 15:17 ` Naoya Horiguchi 2012-03-22 21:29 ` Andrew Morton 2012-03-22 21:29 ` Andrew Morton 2012-03-23 0:05 ` KAMEZAWA Hiroyuki 2012-03-23 0:05 ` KAMEZAWA Hiroyuki 2012-03-22 21:36 ` Andrew Morton 2012-03-22 21:36 ` Andrew Morton 2012-03-22 21:36 ` Andrew Morton 2012-03-23 0:18 ` KAMEZAWA Hiroyuki 2012-03-23 0:18 ` KAMEZAWA Hiroyuki 2012-03-23 0:30 ` Andrew Morton [this message] 2012-03-23 0:30 ` Andrew Morton 2012-03-23 0:52 ` KAMEZAWA Hiroyuki 2012-03-23 0:52 ` KAMEZAWA Hiroyuki 2012-03-23 0:52 ` KAMEZAWA Hiroyuki 2012-03-23 8:53 ` Johannes Weiner 2012-03-23 8:53 ` Johannes Weiner 2012-03-23 9:00 ` KAMEZAWA Hiroyuki 2012-03-23 9:00 ` KAMEZAWA Hiroyuki 2012-03-23 9:00 ` KAMEZAWA Hiroyuki 2012-03-23 9:45 ` Michal Hocko 2012-03-23 9:45 ` Michal Hocko 2012-03-23 9:45 ` Michal Hocko
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