From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> To: David Rientjes <rientjes@google.com> Cc: Satoru Moriya <satoru.moriya@hds.com>, Andrew Morton <akpm@linux-foundation.org>, Rik van Riel <riel@redhat.com>, Randy Dunlap <rdunlap@xenotime.net>, Satoru Moriya <smoriya@redhat.com>, linux-kernel@vger.kernel.org, linux-mm@kvack.org, "lwoodman@redhat.com" <lwoodman@redhat.com>, Seiji Aguchi <saguchi@redhat.com>, Hugh Dickins <hughd@google.com>, hannes@cmpxchg.org Subject: Re: [PATCH -v2 -mm] add extra free kbytes tunable Date: Thu, 13 Oct 2011 14:35:01 +0900 [thread overview] Message-ID: <20111013143501.a59efa5c.kamezawa.hiroyu@jp.fujitsu.com> (raw) In-Reply-To: <alpine.DEB.2.00.1110121654120.30123@chino.kir.corp.google.com> On Wed, 12 Oct 2011 17:01:21 -0700 (PDT) David Rientjes <rientjes@google.com> wrote: > On Wed, 12 Oct 2011, Satoru Moriya wrote: > > I understand what you concern. But in some area such as banking, > > stock exchange, train/power/plant control sysemts etc this kind > > of tunable is welcomed because they can tune their systems at > > their own risk. > > > > You haven't tried the patch that increases the priority of kswapd when > such a latency sensitive thread triggers background reclaim? I don't read full story but....how about adding a new syscall like == sys_mem_shrink(int nid, int nr_scan_pages, int flags) This system call scans LRU of specified nodes and free pages on LRU. This scan nr_scan_pages in LRU and returns the number of successfully freed pages. == Then, running this progam in SCHED_IDLE, a user can make free pages while the system is idle. If running in the highest priority, a user can keep free pages as he want. If a user run this under a memcg, user can free pages in a memcg. Maybe many guys don't want to export memory-shrink facility to userland ;) This is just an idea. Thanks, -Kame
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From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> To: David Rientjes <rientjes@google.com> Cc: Satoru Moriya <satoru.moriya@hds.com>, Andrew Morton <akpm@linux-foundation.org>, Rik van Riel <riel@redhat.com>, Randy Dunlap <rdunlap@xenotime.net>, Satoru Moriya <smoriya@redhat.com>, linux-kernel@vger.kernel.org, linux-mm@kvack.org, "lwoodman@redhat.com" <lwoodman@redhat.com>, Seiji Aguchi <saguchi@redhat.com>, Hugh Dickins <hughd@google.com>, hannes@cmpxchg.org Subject: Re: [PATCH -v2 -mm] add extra free kbytes tunable Date: Thu, 13 Oct 2011 14:35:01 +0900 [thread overview] Message-ID: <20111013143501.a59efa5c.kamezawa.hiroyu@jp.fujitsu.com> (raw) In-Reply-To: <alpine.DEB.2.00.1110121654120.30123@chino.kir.corp.google.com> On Wed, 12 Oct 2011 17:01:21 -0700 (PDT) David Rientjes <rientjes@google.com> wrote: > On Wed, 12 Oct 2011, Satoru Moriya wrote: > > I understand what you concern. But in some area such as banking, > > stock exchange, train/power/plant control sysemts etc this kind > > of tunable is welcomed because they can tune their systems at > > their own risk. > > > > You haven't tried the patch that increases the priority of kswapd when > such a latency sensitive thread triggers background reclaim? I don't read full story but....how about adding a new syscall like == sys_mem_shrink(int nid, int nr_scan_pages, int flags) This system call scans LRU of specified nodes and free pages on LRU. This scan nr_scan_pages in LRU and returns the number of successfully freed pages. == Then, running this progam in SCHED_IDLE, a user can make free pages while the system is idle. If running in the highest priority, a user can keep free pages as he want. If a user run this under a memcg, user can free pages in a memcg. Maybe many guys don't want to export memory-shrink facility to userland ;) This is just an idea. Thanks, -Kame -- 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:[~2011-10-13 5:36 UTC|newest] Thread overview: 102+ messages / expand[flat|nested] mbox.gz Atom feed top 2011-09-01 14:52 [PATCH -mm] add extra free kbytes tunable Rik van Riel 2011-09-01 14:52 ` Rik van Riel 2011-09-01 17:06 ` Randy Dunlap 2011-09-01 17:06 ` Randy Dunlap 2011-09-01 19:26 ` [PATCH -v2 " Rik van Riel 2011-09-01 19:26 ` Rik van Riel 2011-09-01 21:58 ` Andrew Morton 2011-09-01 21:58 ` Andrew Morton 2011-09-01 22:08 ` David Rientjes 2011-09-01 22:08 ` David Rientjes 2011-09-01 22:16 ` Andrew Morton 2011-09-01 22:16 ` Andrew Morton 2011-09-02 16:31 ` Satoru Moriya 2011-09-02 16:31 ` Satoru Moriya 2011-10-13 7:33 ` Minchan Kim 2011-10-13 7:33 ` Minchan Kim 2011-10-13 8:09 ` KAMEZAWA Hiroyuki 2011-10-13 8:09 ` KAMEZAWA Hiroyuki [not found] ` <E1FA588BC672D846BDBB452FCA1E308C2389B4@USINDEVS02.corp.hds.com> 2011-09-15 3:33 ` Satoru Moriya 2011-09-15 3:33 ` Satoru Moriya 2011-09-01 22:09 ` Andrew Morton 2011-09-01 22:09 ` Andrew Morton 2011-09-02 16:26 ` [PATCH -mm] fixes & cleanups for "add extra free kbytes tunable" Rik van Riel 2011-09-02 16:26 ` Rik van Riel 2011-09-30 21:43 ` [PATCH -v2 -mm] add extra free kbytes tunable Johannes Weiner 2011-09-30 21:43 ` Johannes Weiner 2011-10-08 3:08 ` David Rientjes 2011-10-08 3:08 ` David Rientjes 2011-10-10 22:37 ` Andrew Morton 2011-10-10 22:37 ` Andrew Morton 2011-10-11 19:32 ` Satoru Moriya 2011-10-11 19:32 ` Satoru Moriya 2011-10-11 19:54 ` Andrew Morton 2011-10-11 19:54 ` Andrew Morton 2011-10-11 20:23 ` Satoru Moriya 2011-10-11 20:23 ` Satoru Moriya 2011-10-11 20:54 ` Andrew Morton 2011-10-11 20:54 ` Andrew Morton 2011-10-12 13:09 ` Rik van Riel 2011-10-12 13:09 ` Rik van Riel 2011-10-12 19:20 ` Andrew Morton 2011-10-12 19:20 ` Andrew Morton 2011-10-12 19:58 ` Rik van Riel 2011-10-12 19:58 ` Rik van Riel 2011-10-12 20:26 ` David Rientjes 2011-10-12 20:26 ` David Rientjes 2011-10-21 23:48 ` Satoru Moriya 2011-10-21 23:48 ` Satoru Moriya 2011-10-23 21:22 ` David Rientjes 2011-10-23 21:22 ` David Rientjes 2011-10-25 2:04 ` Satoru Moriya 2011-10-25 2:04 ` Satoru Moriya 2011-10-25 21:50 ` David Rientjes 2011-10-25 21:50 ` David Rientjes 2011-10-26 18:59 ` Satoru Moriya 2011-10-26 18:59 ` Satoru Moriya 2011-10-12 21:08 ` Satoru Moriya 2011-10-12 21:08 ` Satoru Moriya 2011-10-12 22:41 ` David Rientjes 2011-10-12 22:41 ` David Rientjes 2011-10-12 23:52 ` Satoru Moriya 2011-10-12 23:52 ` Satoru Moriya 2011-10-13 0:01 ` David Rientjes 2011-10-13 0:01 ` David Rientjes 2011-10-13 5:35 ` KAMEZAWA Hiroyuki [this message] 2011-10-13 5:35 ` KAMEZAWA Hiroyuki 2011-10-13 20:55 ` David Rientjes 2011-10-13 20:55 ` David Rientjes 2011-10-14 22:16 ` Satoru Moriya 2011-10-14 22:16 ` Satoru Moriya 2011-10-14 22:46 ` David Rientjes 2011-10-14 22:46 ` David Rientjes 2011-10-14 5:32 ` Satoru Moriya 2011-10-14 5:32 ` Satoru Moriya 2011-10-14 5:06 ` Satoru Moriya 2011-10-14 5:06 ` Satoru Moriya 2011-10-11 23:22 ` David Rientjes 2011-10-11 23:22 ` David Rientjes 2011-10-13 16:54 ` Satoru Moriya 2011-10-13 16:54 ` Satoru Moriya 2011-10-13 20:48 ` David Rientjes 2011-10-13 20:48 ` David Rientjes 2011-10-13 21:11 ` Rik van Riel 2011-10-13 21:11 ` Rik van Riel 2011-10-13 22:02 ` David Rientjes 2011-10-13 22:02 ` David Rientjes 2011-10-11 19:20 ` Satoru Moriya 2011-10-11 19:20 ` Satoru Moriya 2011-10-11 21:04 ` David Rientjes 2011-10-11 21:04 ` David Rientjes 2011-10-12 13:13 ` Rik van Riel 2011-10-12 13:13 ` Rik van Riel 2011-10-12 20:21 ` David Rientjes 2011-10-12 20:21 ` David Rientjes 2011-10-13 4:13 ` Rik van Riel 2011-10-13 4:13 ` Rik van Riel 2011-10-13 5:22 ` David Rientjes 2011-10-13 5:22 ` David Rientjes 2011-10-22 0:11 ` Satoru Moriya 2011-10-22 0:11 ` Satoru Moriya 2011-09-09 23:01 Satoru Moriya 2011-09-09 23:01 ` Satoru Moriya
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