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Message-ID: <4717C43D.6030204@keyaccess.nl> Date: Thu, 18 Oct 2007 22:38:21 +0200 From: Rene Herman <rene.herman@...access.nl> To: Marcelo Tosatti <marcelo@...ck.org> CC: linux-kernel@...r.kernel.org, riel@...hat.com, drepper@...hat.com Subject: Re: OOM notifications On 10/18/2007 10:25 PM, Marcelo Tosatti wrote: > AIX contains the SIGDANGER signal to notify applications to free up some > unused cached memory: > > http://www.ussg.iu.edu/hypermail/linux/kernel/0007.0/0901.html > > There have been a few discussions on implementing such an idea on Linux, > but nothing concrete has been achieved. > > On the kernel side Rik suggested two notification points: "about to > swap" (for desktop scenarios) and "about to OOM" (for embedded-like > scenarios). > > With that assumption in mind it would be necessary to either have two > special devices for notification, or somehow indicate both events > through the same file descriptor. > > Comments are more than welcome. Given the desktop/embedded distinction you made, do you need both scenarios active at the same time? If not, it seems something like a echo -n <level> >/proc/sys/vm/danger could do with just one sigdanger notification point? (with <level> suitably defined as or in terms of the used threshold value). Rene. - 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/
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