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 A8EE1C61DBD for ; Fri, 28 Aug 2026 14:33:03 +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:Content-Transfer-Encoding: Content-Type:MIME-Version:References:In-Reply-To:Message-ID:Subject:Cc:To: From:Date:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=txgaP3eXPwGHZiNk+kzD9nMiqpi6Z8kpuswwMKDKk10=; b=MOeEd4sQV+iF6NVk5e7QV9YrXF r+W0fftzVRRyaTLmwpUgea14MO7bXGGlXUf4BwoEPcbqOAPm6KlWMIWHo08PKXFWgfnHBqTIC33Ov cO+l5Q02Q0+zr/bf3UOhUEkdm0fgaO1XfMAD8S3pAfBRltRDXke0r2s+6Tk4kH3DFlgmvvAyCiJML 9n1uR+yYxRTk9LPnl6ltpJSsUBN+xvtVoTvYiDDecOp+MMD9zsIgHQCXg+0fmEKpdXIfk/7yrM4aJ qlSFzKg2NVbJH/IUMrMy16vtbIt4banNgGIBwR4FqG6pEMVZSoNKPScV1iWMD0gIfp65XKebTbv+5 uf/HKdeg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wzxdZ-00000005zoe-0F02; Fri, 28 Aug 2026 14:32:57 +0000 Received: from smtprelay0016.hostedemail.com ([216.40.44.16] helo=relay.hostedemail.com) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wzxdW-00000005zo2-3Tq5 for linux-arm-kernel@lists.infradead.org; Fri, 28 Aug 2026 14:32:56 +0000 Received: from omf08.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay03.hostedemail.com (Postfix) with ESMTP id 56281A03CB; Fri, 28 Aug 2026 14:32:47 +0000 (UTC) Received: from [HIDDEN] (Authenticated sender: rostedt@goodmis.org) by omf08.hostedemail.com (Postfix) with ESMTPA id 68DD520027; Fri, 28 Aug 2026 14:32:38 +0000 (UTC) Date: Fri, 28 Aug 2026 10:33:28 -0400 From: Steven Rostedt To: Peter Zijlstra Cc: David Stevens , 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 , 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, jstultz@google.com Subject: Re: [RFC 00/10] Reclaimable kernel stacks Message-ID: <20260828103328.633bbfbc@gandalf.local.home> In-Reply-To: <20260828124758.GP687043@noisy.programming.kicks-ass.net> References: <20260827232948.2520558-1-stevensd@google.com> <20260828124758.GP687043@noisy.programming.kicks-ass.net> X-Mailer: Claws Mail 3.20.0git84 (GTK+ 2.24.33; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 68DD520027 X-Stat-Signature: ztkfmnrpgu49shqhx5dux69fx5guyh4n X-Rspamd-Server: rspamout07 X-Session-Marker: 726F737465647440676F6F646D69732E6F7267 X-Session-ID: U2FsdGVkX1/SjYl3uwJx4/ioiGGgwrjcuLujqecRKpg= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=goodmis.org; h=date:from:to:cc:subject:message-id:in-reply-to:references:mime-version:content-type:content-transfer-encoding; s=dkim1; bh=txgaP3eXPwGHZiNk+kzD9nMiqpi6Z8kpuswwMKDKk10=; b=PTsDfFpy3Vn67qp+64dLKVjQMOectY5i18n4Kp3f0JbzDuDbg7QuhtcfWz3fQ0TXyhJjaIW8ExLbYtONSHMQyC1lyZxg1V6i+rr5HmbeaXTfnqg0mSKpLe1M7Xz4Ctw9aeW54P5Vi/KVRNyogahr68RbAAuK75JA7ttYZ7ZvTJg= X-HE-Tag: 1787927558-448627 X-HE-Meta: U2FsdGVkX1/ynCiK2eODLPrYZ9tK1G7fze2omD18GRMu+p//Za8+4H8RGGJDHLXLBjpOVe3LkBV8eMOFg5z3gwtX0OJ59kPUZ1lXGuPE1Jngey2WvrHtD2Ios5dJmmCOW6/JzjEJjZR90rWu8s+8+rGI/f3PjKGR+amq7feErZbTZBZRK1a0gZQoVjeHxPsRe1WHdO9gAWNFsSVvOHPGAZ3BLjjMhQSGqs6mMT5JrzNV9F/rZcZ43kHOPupCbE6Oeze20thPJ6wIJ05cvfQ3P1S19nukkkme0//ZjrjG06nJBIEqqfBqKclCyd8maOH2IMWUNDJmDCxPXN7KuEq4eel3RCvHJX/rMXNPrmNloIAPLi5whsjRBjeIKs43ysEB X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260828_073255_082586_2DCCAEB8 X-CRM114-Status: GOOD ( 10.74 ) 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 Fri, 28 Aug 2026 14:47:58 +0200 Peter Zijlstra wrote: > > On Android, system processes typically have 2000-3000 threads. App > > processes add 1000s more threads on top of this. > > WTF ?!? Why does that all spawn *that* many threads? Perhaps work on > reducing that some? I guess you never ran Java ;-) -- Steve