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Message-ID: <20071030145720.GB27039@atrey.karlin.mff.cuni.cz> Date: Tue, 30 Oct 2007 15:57:20 +0100 From: Jan Kara <jack@...e.cz> To: Marcelo Tosatti <marcelo@...ck.org> Cc: linux-kernel@...r.kernel.org, drepper@...hat.com, riel@...hat.com Subject: Re: OOM notifications Hello, > 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. Actually, wouldn't a generic netlink interface be more elegant? Then we could connect it with DBUS and it would be much easier for applications (Desktop) to handle such events. I agree that near-to-oom conditions are quite volatile and maybe we want a technically simple (and thus more reliable) mechanism for the notification but I anyway wanted to point to this possibility. Honza -- Jan Kara <jack@...e.cz> SuSE CR Labs - 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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