lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Fri, 28 May 2010 13:46:53 +0900 (JST) From: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> To: balbir@...ux.vnet.ibm.com Cc: kosaki.motohiro@...fujitsu.com, "Luis Claudio R. Goncalves" <lclaudio@...g.org>, Oleg Nesterov <oleg@...hat.com>, linux-kernel@...r.kernel.org, linux-mm@...ck.org, Thomas Gleixner <tglx@...utronix.de>, Peter Zijlstra <peterz@...radead.org>, David Rientjes <rientjes@...gle.com>, Mel Gorman <mel@....ul.ie>, williams@...hat.com Subject: Re: [RFC] oom-kill: give the dying task a higher priority > * Luis Claudio R. Goncalves <lclaudio@...g.org> [2010-05-28 00:51:47]: > > > @@ -382,6 +382,8 @@ static void dump_header(struct task_struct *p, gfp_t gfp_mask, int order, > > */ > > static void __oom_kill_task(struct task_struct *p, int verbose) > > { > > + struct sched_param param; > > + > > if (is_global_init(p)) { > > WARN_ON(1); > > printk(KERN_WARNING "tried to kill init!\n"); > > @@ -413,8 +415,9 @@ static void __oom_kill_task(struct task_struct *p, int verbose) > > */ > > p->rt.time_slice = HZ; > > set_tsk_thread_flag(p, TIF_MEMDIE); > > - > > force_sig(SIGKILL, p); > > + param.sched_priority = MAX_RT_PRIO-1; > > + sched_setscheduler_nocheck(p, SCHED_FIFO, ¶m); > > } > > > > I would like to understand the visible benefits of this patch. Have > you seen an OOM kill tasked really get bogged down. Should this task > really be competing with other important tasks for run time? What you mean important? Until OOM victim task exit completely, the system have no memory. all of important task can't do anything. In almost kernel subsystems, automatically priority boost is really bad idea because it may break RT task's deterministic behavior. but OOM is one of exception. The deterministic was alread broken by memory starvation. That's the reason I acked it. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists