From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf0-f198.google.com (mail-pf0-f198.google.com [209.85.192.198]) by kanga.kvack.org (Postfix) with ESMTP id 638E86B030C for ; Tue, 12 Sep 2017 00:48:09 -0400 (EDT) Received: by mail-pf0-f198.google.com with SMTP id q76so18785910pfq.5 for ; Mon, 11 Sep 2017 21:48:09 -0700 (PDT) Received: from mail-sor-f65.google.com (mail-sor-f65.google.com. [209.85.220.65]) by mx.google.com with SMTPS id l30sor2283390pgc.80.2017.09.11.21.48.07 for (Google Transport Security); Mon, 11 Sep 2017 21:48:07 -0700 (PDT) Date: Tue, 12 Sep 2017 13:48:03 +0900 From: Sergey Senozhatsky Subject: Re: [PATCH 3/5] mm:swap: introduce SWP_SYNCHRONOUS_IO Message-ID: <20170912044803.GB3963@jagdpanzerIV.localdomain> References: <1505183833-4739-1-git-send-email-minchan@kernel.org> <1505183833-4739-3-git-send-email-minchan@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1505183833-4739-3-git-send-email-minchan@kernel.org> Sender: owner-linux-mm@kvack.org List-ID: To: Minchan Kim Cc: Andrew Morton , linux-mm@kvack.org, linux-kernel@vger.kernel.org, kernel-team , Ilya Dryomov , Sergey Senozhatsky On (09/12/17 11:37), Minchan Kim wrote: [..] > If rw-page based fast storage is used for swap devices, we need to > detect it to enhance swap IO operations. > This patch is preparation for optimizing of swap-in operation with > next patch. > > Signed-off-by: Minchan Kim > --- > include/linux/swap.h | 3 ++- > mm/swapfile.c | 3 +++ > 2 files changed, 5 insertions(+), 1 deletion(-) > > diff --git a/include/linux/swap.h b/include/linux/swap.h > index 8a807292037f..0f54b491e118 100644 > --- a/include/linux/swap.h > +++ b/include/linux/swap.h > @@ -170,8 +170,9 @@ enum { > SWP_AREA_DISCARD = (1 << 8), /* single-time swap area discards */ > SWP_PAGE_DISCARD = (1 << 9), /* freed swap page-cluster discards */ > SWP_STABLE_WRITES = (1 << 10), /* no overwrite PG_writeback pages */ > + SWP_SYNCHRONOUS_IO = (1<<11), /* synchronous IO is efficient */ a nitpick: (1 << 11) -ss > /* add others here before... */ > - SWP_SCANNING = (1 << 11), /* refcount in scan_swap_map */ > + SWP_SCANNING = (1 << 12), /* refcount in scan_swap_map */ > }; -- 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/ . Don't email: email@kvack.org