From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from relay.hostedemail.com (smtprelay0012.hostedemail.com [216.40.44.12]) (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 C170F46F4BA for ; Fri, 28 Aug 2026 14:32:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=216.40.44.12 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787927582; cv=none; b=tRHmTMpm8Kd2vI5znnYTP25AgESiiqj3kZcohZMV24UYLmZ9OXjnRRVQVuXQ41YxElbcOhdfwGLbBx7c5udk+41wzLBl97jvO77axT0hfsrEwLRX7iuxlCSS1UOkl+WnI4EF2dtpj1fqWfpI/xa5RFyvNbtu07niSxROPMYqNII= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787927582; c=relaxed/simple; bh=gSswE62nZO1pM/YMe3vEMOmmy6ONtBAf7AP4Kv4dNqQ=; h=Date:From:To:Cc:Subject:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=LCSFlTSq4ATO49u2+zzSN3BJ8b3/W7YccxxRToU4H4YZ3+CkuzXOKxRePGSS0cia+8xy/y6uWpU7aZ4m1W2a755d94wLvP2stMN2VoOz/VUEfMt0N7i5n9B66ph7BxxC+PhHRmcs5AWPB7BwOYD3D9pIzziJWsybGPX4sSCjElQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=goodmis.org; spf=pass smtp.mailfrom=goodmis.org; dkim=pass (1024-bit key) header.d=goodmis.org header.i=@goodmis.org header.b=PTsDfFpy; arc=none smtp.client-ip=216.40.44.12 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=goodmis.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=goodmis.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=goodmis.org header.i=@goodmis.org header.b="PTsDfFpy" 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) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: 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 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