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Date: Tue, 13 May 2008 09:11:01 -0400 From: Rik van Riel <riel@...hat.com> To: Daisuke Nishimura <nishimura@....nes.nec.co.jp> Cc: lee.schermerhorn@...com, akpm@...ux-foundation.org, kosaki.motohiro@...fujitsu.com, linux-kernel@...r.kernel.org Subject: Re: [PATCH -mm 05/15] free swap space on swap-in/activation On Tue, 13 May 2008 22:00:44 +0900 Daisuke Nishimura <nishimura@....nes.nec.co.jp> wrote: > On 2008/05/12 22:33 +0900, Rik van Riel wrote: > > On Mon, 12 May 2008 20:21:32 +0900 > > Daisuke Nishimura <nishimura@....nes.nec.co.jp> wrote: > > > >> So, the intention of this patch is > >> not to free a swap space of swap cache that has already swapped in > >> and only used one process as do_swap_page() does, > >> but to free a swap space that is only used as a swap cache > >> (not used by any processes), right? > > > > No. The code should also free the swap space of pages that are > > mapped by processes, in order to free up swap space for other > > uses. This only happens if vm_swap_full() is true. > > > > OK. > > I thought that current code cannot free the swap space > of pages that are mapped by processes(and I think it cannot), > so I asked the intention of this patch for clarification. You may be right, due to the refcounting magic that is going on. I will verify the code and send in a fix if it turns out to be needed. -- All rights reversed. -- 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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