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Message-ID: <20071004094920.GA407@elf.ucw.cz> Date: Thu, 4 Oct 2007 11:49:20 +0200 From: Pavel Machek <pavel@....cz> To: Andrew Morton <akpm@...l.org>, kernel list <linux-kernel@...r.kernel.org> Subject: vm.txt: document min_free_pages as critical for correctness min_free_pages is critical for correctness, document it as such. Signed-off-by: Pavel Machek <pavel@...e.cz> index a0ccc5b..e460c19 100644 --- a/Documentation/sysctl/vm.txt +++ b/Documentation/sysctl/vm.txt @@ -111,6 +111,12 @@ of kilobytes free. The VM uses this num value for each lowmem zone in the system. Each lowmem zone gets a number of reserved free pages based proportionally on its size. +Some minimal ammount of memory is needed to satisfy PF_MEMALLOC +allocations; if you set this to lower than 1024KB, your system will +become subtly broken, and prone to deadlock under high loads. + +Setting this too high will OOM your machine instantly. + ============================================================== percpu_pagelist_fraction -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html - 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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