From: David Rientjes <rientjes@google.com>
To: "Figo.zhang" <figo1802@gmail.com>
Cc: lkml <linux-kernel@vger.kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
Andrew Morton <akpm@osdl.org>
Subject: Re: [PATCH]oom-kill: direct hardware access processes should get bonus
Date: Mon, 1 Nov 2010 20:10:47 -0700 (PDT) [thread overview]
Message-ID: <alpine.DEB.2.00.1011012008160.9383@chino.kir.corp.google.com> (raw)
In-Reply-To: <1288662213.10103.2.camel@localhost.localdomain>
On Tue, 2 Nov 2010, Figo.zhang wrote:
> the victim should not directly access hardware devices like Xorg server,
> because the hardware could be left in an unpredictable state, although
> user-application can set /proc/pid/oom_score_adj to protect it. so i think
> those processes should get 3% bonus for protection.
>
Which applications are you referring to that cannot gracefully exit if
killed?
> Signed-off-by: Figo.zhang <figo1802@gmail.com>
> ---
> mm/oom_kill.c | 8 +++++---
> 1 files changed, 5 insertions(+), 3 deletions(-)
>
> diff --git a/mm/oom_kill.c b/mm/oom_kill.c
> index 4029583..df6a9da 100644
> --- a/mm/oom_kill.c
> +++ b/mm/oom_kill.c
> @@ -195,10 +195,12 @@ unsigned int oom_badness(struct task_struct *p, struct mem_cgroup *mem,
> task_unlock(p);
>
> /*
> - * Root processes get 3% bonus, just like the __vm_enough_memory()
> - * implementation used by LSMs.
> + * Root and direct hardware access processes get 3% bonus, just like the
> + * __vm_enough_memory() implementation used by LSMs.
LSM's have this bonus for CAP_SYS_ADMIN, but not for CAP_SYS_RAWIO, so
this comment is incorrect.
> */
> - if (has_capability_noaudit(p, CAP_SYS_ADMIN))
> + if (has_capability_noaudit(p, CAP_SYS_ADMIN) ||
> + has_capability_noaudit(p, CAP_SYS_RESOURCE) ||
> + has_capability_noaudit(p, CAP_SYS_RAWIO))
> points -= 30;
>
> /*
CAP_SYS_RAWIO had a much more dramatic impact in the previous heuristic to
such a point that it would often allow memory hogging tasks to elude the
oom killer at the expense of innocent tasks. I'm not sure this is the
best way to go.
next prev parent reply other threads:[~2010-11-02 3:10 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-02 1:43 [PATCH]oom-kill: direct hardware access processes should get bonus Figo.zhang
2010-11-02 3:10 ` David Rientjes [this message]
2010-11-02 14:24 ` Figo.zhang
2010-11-02 19:34 ` David Rientjes
2010-11-03 23:43 ` [PATCH v2]oom-kill: CAP_SYS_RESOURCE " Figo.zhang
2010-11-03 23:47 ` David Rientjes
[not found] ` <AANLkTimjfmLzr_9+Sf4gk0xGkFjffQ1VcCnwmCXA88R8@mail.gmail.com>
2010-11-04 1:38 ` Figo.zhang
2010-11-04 1:50 ` David Rientjes
2010-11-04 2:12 ` Figo.zhang
2010-11-04 2:54 ` David Rientjes
2010-11-04 4:42 ` Figo.zhang
2010-11-04 5:08 ` David Rientjes
2010-11-09 11:01 ` [PATCH " KOSAKI Motohiro
2010-11-09 12:24 ` Alan Cox
2010-11-09 21:06 ` David Rientjes
2010-11-09 21:25 ` David Rientjes
2010-11-10 14:38 ` Figo.zhang
2010-11-10 20:50 ` David Rientjes
2010-11-09 10:41 ` [PATCH]oom-kill: direct hardware access processes " KOSAKI Motohiro
2010-11-09 12:24 ` [PATCH v2]mm/oom-kill: " Figo.zhang
2010-11-09 21:16 ` David Rientjes
2010-11-10 14:48 ` Figo.zhang
2010-11-14 5:07 ` KOSAKI Motohiro
2010-11-14 21:29 ` David Rientjes
2010-11-15 1:24 ` KOSAKI Motohiro
2010-11-15 10:03 ` David Rientjes
2010-11-23 7:16 ` KOSAKI Motohiro
2010-11-28 1:36 ` David Rientjes
2010-11-30 13:00 ` KOSAKI Motohiro
2010-11-30 20:05 ` David Rientjes
2010-11-10 15:14 ` [PATCH v3]mm/oom-kill: " Figo.zhang
2010-11-10 15:24 ` Figo.zhang
2010-11-10 21:00 ` David Rientjes
2010-11-14 5:21 ` KOSAKI Motohiro
2010-11-14 21:33 ` David Rientjes
2010-11-15 3:26 ` [PATCH] Revert oom rewrite series Figo.zhang
2010-11-15 10:14 ` David Rientjes
2010-11-15 10:57 ` Alan Cox
2010-11-15 20:54 ` David Rientjes
2010-11-23 7:16 ` KOSAKI Motohiro
2011-01-04 7:51 ` [PATCH v3]mm/oom-kill: direct hardware access processes should get bonus Figo.zhang
2011-01-04 8:28 ` KAMEZAWA Hiroyuki
2011-01-04 8:56 ` Figo.zhang
2011-01-06 0:55 ` KAMEZAWA Hiroyuki
2011-01-05 3:32 ` David Rientjes
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