From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Kirill A. Shutemov" Subject: Re: [patch 1/3] mm: embed the memcg pointer directly into struct page Date: Mon, 3 Nov 2014 23:06:07 +0200 Message-ID: <20141103210607.GA24091@node.dhcp.inet.fi> References: <1414898156-4741-1-git-send-email-hannes@cmpxchg.org> Mime-Version: 1.0 Return-path: DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=shutemov.name; s=default; t=1415048768; bh=oU4zWXNv+8Ub1DdnTj6wf9l7BP/W0aT1LKX7dY6FGaw=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=V8HR/CaIaBBFK+xn1fWw1sX5T7Durz3WmI2bZhnUZWVUcxTqgRRRC2rUGlXC6kp5n zgHCaov+9gX/NjJ3OhLBohIzHN6TM+zHFGXGnlpfMl9qnFUoMnMDv4qcAzQbe36U2e pJqWpU9mCQ7w1wrmcIDGp6qv3TctmvqAWtu1JWb4= Content-Disposition: inline In-Reply-To: <1414898156-4741-1-git-send-email-hannes@cmpxchg.org> Sender: owner-linux-mm@kvack.org List-ID: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Johannes Weiner Cc: Andrew Morton , Michal Hocko , Vladimir Davydov , Tejun Heo , David Miller , linux-mm@kvack.org, cgroups@vger.kernel.org, linux-kernel@vger.kernel.org On Sat, Nov 01, 2014 at 11:15:54PM -0400, Johannes Weiner wrote: > Memory cgroups used to have 5 per-page pointers. To allow users to > disable that amount of overhead during runtime, those pointers were > allocated in a separate array, with a translation layer between them > and struct page. > > There is now only one page pointer remaining: the memcg pointer, that > indicates which cgroup the page is associated with when charged. The > complexity of runtime allocation and the runtime translation overhead > is no longer justified to save that *potential* 0.19% of memory. How much do you win by the change? -- Kirill A. Shutemov -- 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