From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8D48529429; Fri, 24 May 2024 20:36:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716582987; cv=none; b=ZUOrC3xi3AtiUVrCpyXwhKerh87pd9CvUsinBpizbJI4KMoOBwA5ySBFDGJ48K4+OZLGPgocjA739EsCmGUp6Pkc+XpmoQI5rp53vUHEQm8OvqgdH2w+b/tqwdeVaesxbZkg6reYYwXnMXwvEugZFBtCpp7/7eillUdldGVXX9s= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716582987; c=relaxed/simple; bh=VQHmXG+j7PIHbzuECBnhhjZXJ0/jfoHRjIEPxqgUvcc=; h=Date:From:To:Cc:Subject:Message-Id:In-Reply-To:References: Mime-Version:Content-Type; b=V/IPEBvVh6fzRNHdWXB/NDKqe+1XxicVXAMMX9MC0lpm0J/wEEZ92Mwy7+HKIs70hswVgMJij1HUq4/SHJmGosmVBkBpnqu/OjwXRocRbf1hjD8tgNlh58BIMT4J3eZXoHSRacUwNoRcdj+1/YB5z/Gflbpv7MlZ+zHFfUxPjk8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=NUxhJpQH; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="NUxhJpQH" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1DFC6C2BBFC; Fri, 24 May 2024 20:36:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1716582986; bh=VQHmXG+j7PIHbzuECBnhhjZXJ0/jfoHRjIEPxqgUvcc=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=NUxhJpQHXzT8PNJ83TzM/Wyp7kA/0w4J+WQYT+Wu4k0sa3m8G8xl3BNOMp37SP9HV 0tgzjDAHHTu1wYhzBuKAm1A4vXPKn0utxjLaLRdE0uImOu002lRbNx60dcMIMxqcLP MkK89kBjNagawGOzBfTC1B9llYq6VCsrbxXyANoc= Date: Fri, 24 May 2024 13:36:24 -0700 From: Andrew Morton To: David Rientjes Cc: Sourav Panda , corbet@lwn.net, gregkh@linuxfoundation.org, rafael@kernel.org, mike.kravetz@oracle.com, muchun.song@linux.dev, rppt@kernel.org, david@redhat.com, rdunlap@infradead.org, chenlinxuan@uniontech.com, yang.yang29@zte.com.cn, tomas.mudrunka@gmail.com, bhelgaas@google.com, ivan@cloudflare.com, pasha.tatashin@soleen.com, yosryahmed@google.com, hannes@cmpxchg.org, shakeelb@google.com, kirill.shutemov@linux.intel.com, wangkefeng.wang@huawei.com, adobriyan@gmail.com, Vlastimil Babka , "Liam R. Howlett" , surenb@google.com, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-doc@vger.kernel.org, linux-mm@kvack.org, Matthew Wilcox , weixugc@google.com Subject: Re: [PATCH v12] mm: report per-page metadata information Message-Id: <20240524133624.9d9e3935a0c99700b67cee5f@linux-foundation.org> In-Reply-To: <1e1b89af-3b7a-7400-cfd7-d22a101955de@google.com> References: <20240512010611.290464-1-souravpanda@google.com> <45fb4c94-dd77-94c3-f08f-81bf31e6d6d2@google.com> <1e1b89af-3b7a-7400-cfd7-d22a101955de@google.com> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Fri, 24 May 2024 13:00:06 -0700 (PDT) David Rientjes wrote: > This would be a very useful extension to be able to provide observability > of per-page metadata overhead and the impact of things like HVO on the > overall footprint. Today, we don't have observability for this memory > overhead. > > Andrew, anything else that can be addressed before this is eligible for > staging in MM unstable? I've asked Sourav to prepare a v13, largely to see if we can get a few more eyeballs onto this.