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 4BACCC61DCB for ; Fri, 28 Aug 2026 14:35:57 +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=ckaGVw74rY49wuwKahOscpW27wYJycDGKErZJGjW1ng=; b=Q+3wlHdtsCqVSe0u6p1g64HT0J V/86wTARkU0SohfMsk9K+VUWxTw45HMHx4kXP70TXpmy2ZrFhXUdQIuv9aVIvps676wAq6DXgO+Os vh06D5cQgt40as7FfrY3y+838pukBVOfwSPn2k/1+zbDo3Yc1VbFOvClJWsdis2A8oeOn8rJbWbzI 6N36A7tAHSsghin+HyfG+JxrmIcmijLnp3TQkszTr2zKMQIgxBPpPOXrutfqQHCJcSZYgjwpJ1asJ 3lkv34QzsVTiiJesS3bSga3ixKYS0XsKvrmyD9e20l6KFyDBgiqAPDFmy8Ul8h6JxvV2lXcri0hT5 ZxXAovkA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wzxgI-0000000608v-2Apg; Fri, 28 Aug 2026 14:35:46 +0000 Received: from desiato.infradead.org ([2001:8b0:10b:1:d65d:64ff:fe57:4e05]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wzxgH-0000000608j-1DQc; Fri, 28 Aug 2026 14:35:45 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; 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=ckaGVw74rY49wuwKahOscpW27wYJycDGKErZJGjW1ng=; b=j/13ETx4G/dFNQw+O8eobyyQgc vb65HchRPDcYLjcyC/fkNRFPF7qas14vbb7S1GpoV2I2Af6KgW93+TAewKnJQ9jPgtqk2OZ4eDYpF 0eGT9oIxEXXxMOGJnz+Zvxpz77VhnwgFGBfGc5FM67FuzGeN+I5Mafj28D5LTj5F8G/dZkV4yJK4+ g/PyiaahSQ3iyujx49bRLJZiZUJ+yXgaIlR0W2Rw3AYelbw6TU3UACtgxtALW4lUBvYYMD2rKLFE7 q1zfp3Kbtkb7ki2dRGweNoxO9hxDIgG19FTnmrcPYemQ1XaAxnkT1xTxBpc0pWM6eJJY7vgg4Z1ww by1BAlOw==; Received: from 77-249-17-252.cable.dynamic.v4.ziggo.nl ([77.249.17.252] helo=noisy.programming.kicks-ass.net) by desiato.infradead.org with esmtpsa (Exim 4.99.2 #2 (Red Hat Linux)) id 1wzxgE-00000008KRq-2kIR; Fri, 28 Aug 2026 14:35:42 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id AC76130030F; Fri, 28 Aug 2026 16:35:40 +0200 (CEST) Date: Fri, 28 Aug 2026 16:35:40 +0200 From: Peter Zijlstra To: Steven Rostedt 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: <20260828143540.GV776954@noisy.programming.kicks-ass.net> References: <20260827232948.2520558-1-stevensd@google.com> <20260828124758.GP687043@noisy.programming.kicks-ass.net> <20260828103328.633bbfbc@gandalf.local.home> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260828103328.633bbfbc@gandalf.local.home> 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, Aug 28, 2026 at 10:33:28AM -0400, Steven Rostedt wrote: > 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 ;-) Of course not; why would you want to do something that silly ;-)