From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx200.postini.com [74.125.245.200]) by kanga.kvack.org (Postfix) with SMTP id 959976B00F5 for ; Wed, 18 Apr 2012 16:01:42 -0400 (EDT) Received: by lagz14 with SMTP id z14so7876873lag.14 for ; Wed, 18 Apr 2012 13:01:40 -0700 (PDT) Date: Wed, 18 Apr 2012 23:01:02 +0300 (EEST) From: Pekka Enberg Subject: Re: [PATCH 2/2] vmevent: Implement greater-than attribute and one-shot mode In-Reply-To: <20120418083523.GB31556@lizard> Message-ID: References: <20120418083208.GA24904@lizard> <20120418083523.GB31556@lizard> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org List-ID: To: Anton Vorontsov Cc: Leonid Moiseichuk , John Stultz , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linaro-kernel@lists.linaro.org, patches@linaro.org On Wed, 18 Apr 2012, Anton Vorontsov wrote: > This patch implements a new event type, it will trigger whenever a > value becomes greater than user-specified threshold, it complements > the 'less-then' trigger type. > > Also, let's implement the one-shot mode for the events, when set, > userspace will only receive one notification per crossing the > boundaries. > > Now when both LT and GT are set on the same level, the event type > works as a cross event type: it triggers whenever a value crosses > the threshold from a lesser values side to a greater values side, > and vice versa. > > We use the event types in an userspace low-memory killer: we get a > notification when memory becomes low, so we start freeing memory by > killing unneeded processes, and we get notification when memory hits > the threshold from another side, so we know that we freed enough of > memory. > > Signed-off-by: Anton Vorontsov Did you try vmevent-test with this patch? I'm seeing this: Physical pages: 109858 read failed: Invalid argument Pekka -- 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: email@kvack.org