linux-kernel - Re: [PATCH 01/02] swap: discard while swapping only if SWAP_FLAG_DISCARD

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Message-ID: <CAHGf_=qU5nBeya=God5AyG2szvtJJCDd4VOt0TJZBgiEX27Njw@mail.gmail.com>
Date:	Sun, 26 May 2013 07:44:56 -0400
From:	KOSAKI Motohiro <kosaki.motohiro@...il.com>
To:	Rafael Aquini <aquini@...hat.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>, shli@...nel.org,
	kzak@...hat.com, Jeff Moyer <jmoyer@...hat.com>,
	"riel@...hat.com" <riel@...hat.com>,
	Larry Woodman <lwoodman@...hat.com>,
	Mel Gorman <mgorman@...e.de>
Subject: Re: [PATCH 01/02] swap: discard while swapping only if SWAP_FLAG_DISCARD_PAGES

> +                       /*
> +                        * By flagging sys_swapon, a sysadmin can tell us to
> +                        * either do sinle-time area discards only, or to just
> +                        * perform discards for released swap page-clusters.
> +                        * Now it's time to adjust the p->flags accordingly.
> +                        */
> +                       if (swap_flags & SWAP_FLAG_DISCARD_ONCE)
> +                               p->flags &= ~SWP_PAGE_DISCARD;
> +                       else if (swap_flags & SWAP_FLAG_DISCARD_PAGES)
> +                               p->flags &= ~SWP_AREA_DISCARD;

When using old swapon(8), this code turn off both flags, right?
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