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Date: Thu, 7 Oct 2010 08:44:59 +0530 From: Balbir Singh <balbir@...ux.vnet.ibm.com> To: Daisuke Nishimura <nishimura@....nes.nec.co.jp> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>, containers@...ts.linux-foundation.org, "linux-mm@...ck.org" <linux-mm@...ck.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> Subject: Re: [RFC] Restrict size of page_cgroup->flags * nishimura@....nes.nec.co.jp <nishimura@....nes.nec.co.jp> [2010-10-07 09:54:58]: > On Wed, 6 Oct 2010 19:53:14 +0530 > Balbir Singh <balbir@...ux.vnet.ibm.com> wrote: > > > I propose restricting page_cgroup.flags to 16 bits. The patch for the > > same is below. Comments? > > > > > > Restrict the bits usage in page_cgroup.flags > > > > From: Balbir Singh <balbir@...ux.vnet.ibm.com> > > > > Restricting the flags helps control growth of the flags unbound. > > Restriciting it to 16 bits gives us the possibility of merging > > cgroup id with flags (atomicity permitting) and saving a whole > > long word in page_cgroup > > > I agree that reducing the size of page_cgroup would be good and important. > But, wouldn't it be better to remove ->page, if possible ? > Without the page pointer, how do we go from pc to page for reclaim? -- Three Cheers, Balbir -- 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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