From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 24B4FC61DCB for ; Fri, 28 Aug 2026 11:54:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=/lOeYdMQM0yEpqRm+8VJ/e9jItYU1+vsePznvGbz10E=; b=OWZ2wDx+i8+pBfKoq5ETTeBHV2 D7JcEumjZbX/ZYWrlvBRjcOnZsY6BLMmREQvavAs10tlvHSsOSZl7b8bv114uSYMzCVEvXM8YWROW aMqOnSKo1xaWnXePKYWimUgXslqR6Hr4uCrmCAl1YkF4ZZ4RSOvxkm58p1IVAkI8up7qfFWUIRYGi /U04wdNyddqXW9tZCGuYSwFv3QL8CkG1dXyB8+b3ksKmcuh4QJun5C78BE0+hsCDy8fWNO94HjmJ1 1Q3i30A2IaVqVxWlW6c7CgzPmjUzMzF+yDbozzq0ukmB3qOTbz+7UEGwmmoCq8F0v809DhmXXsg4V G/0Ziamg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wzvA5-00000005go0-1T47; Fri, 28 Aug 2026 11:54:21 +0000 Received: from casper.infradead.org ([2001:8b0:10b:1236::1]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wzvA4-00000005gns-1BEw; Fri, 28 Aug 2026 11:54:20 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=/lOeYdMQM0yEpqRm+8VJ/e9jItYU1+vsePznvGbz10E=; b=g5q3o2RCbyi+Yqbp+LTKaPTquE 7gXYHP3tdr0knxX02PNNzCPOBFWn57YdhfVMe2wVBn0jGTz5C70WZiFqi6q+gGpJPkpRmT276v/iI Nx0JCxTzmg7piqalBDEI5CPqK/IwzqOegpNF6bmFCbfFSyS7FPEGTGn4XOICrl7KJogrp6jKLKtiQ BFLUSYdoBlhM6+BShUVl6Sc7u4HOo0ZtjEDUm1F2Mv+GRSw0GDtY23DSYzC52ibhjXBiKIkIMO7OJ m942aboClPHVMssGPyAA7ZQN5VBksW6w6zHJtn0ckV3dbahbmennTJsAMre8Tcbx+K52/+vDwChBY c6XrVZ4w==; Received: from 77-249-17-252.cable.dynamic.v4.ziggo.nl ([77.249.17.252] helo=noisy.programming.kicks-ass.net) by casper.infradead.org with esmtpsa (Exim 4.99.1 #2 (Red Hat Linux)) id 1wzv9w-0000000EdPK-1I3d; Fri, 28 Aug 2026 11:54:12 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id 4D3CF30030F; Fri, 28 Aug 2026 13:54:10 +0200 (CEST) Date: Fri, 28 Aug 2026 13:54:10 +0200 From: Peter Zijlstra To: David Stevens Cc: Catalin Marinas , Will Deacon , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H . Peter Anvin" , Andrew Morton , Dave Chinner , Qi Zheng , Roman Gushchin , Muchun Song , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Valentin Schneider , K Prateek Nayak , Uladzislau Rezki , David Hildenbrand , Lorenzo Stoakes , "Liam R . Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Kees Cook , Sebastian Andrzej Siewior , Clark Williams , suleiman@google.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, linux-rt-devel@lists.linux.dev Subject: Re: [RFC 06/10] Reclaim memory from blocked kernel stacks Message-ID: <20260828115410.GL687043@noisy.programming.kicks-ass.net> References: <20260827232948.2520558-1-stevensd@google.com> <20260827232948.2520558-7-stevensd@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260827232948.2520558-7-stevensd@google.com> X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, Aug 27, 2026 at 04:29:44PM -0700, David Stevens wrote: > A new TASK_STACK_RECLAIM state is introduced for tasks that are > blocked waiting for the stacks to be repopulated. Not yet read the full patch, but *why*.