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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 50118C43334 for ; Tue, 28 Jun 2022 00:17:49 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id DD5928E0002; Mon, 27 Jun 2022 20:17:48 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id D85178E0001; Mon, 27 Jun 2022 20:17:48 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id C4C208E0002; Mon, 27 Jun 2022 20:17:48 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0016.hostedemail.com [216.40.44.16]) by kanga.kvack.org (Postfix) with ESMTP id B27C28E0001 for ; Mon, 27 Jun 2022 20:17:48 -0400 (EDT) Received: from smtpin05.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay10.hostedemail.com (Postfix) with ESMTP id 8B81D1130 for ; Tue, 28 Jun 2022 00:17:48 +0000 (UTC) X-FDA: 79625731416.05.C2253AD Received: from gentwo.de (gentwo.de [161.97.139.209]) by imf13.hostedemail.com (Postfix) with ESMTP id 60FDA20026 for ; Tue, 28 Jun 2022 00:17:47 +0000 (UTC) Received: by gentwo.de (Postfix, from userid 1001) id 2B277B0038E; Tue, 28 Jun 2022 02:17:45 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gentwo.de; s=default; t=1656375465; bh=SJXCcMcSxSjIoTWs93tG3LqaSSkxWzvsKdPYXR1oFIA=; h=Date:From:To:cc:Subject:In-Reply-To:References:From; b=erlmz3EGFv6lwFYI7JASIA/c66ORgFEfC/SmBPSlaGqyyFYckpUCCuViXEQwie8YT EAdDoLz8ZVmfysezs2Ynpbgf8cp2s4YmxqbOBnBuaIms6tzkgyWyfhIzPUezPUvoWE 2QTEl5WpxO0NtdFCfBdl+Izt2o/q3RhrnPXw4uaSdd4tszq/D/uv07QH6E4WU88Jme J2Y7yhusy7PwCFDkII/YFTXsayAZuxx8hwNkL8Mgpuf+uRLUT+/bz5NHAD66s9zLF3 XScyAUKN/+UtW02zFB0te6DpnA+fBwxGh2KnK9cG94GU5g+DSN0oQP+CzVBX2nVLej 9Mm+canqrZtdw== Received: from localhost (localhost [127.0.0.1]) by gentwo.de (Postfix) with ESMTP id 299D8B002EA; Tue, 28 Jun 2022 02:17:45 +0200 (CEST) Date: Tue, 28 Jun 2022 02:17:45 +0200 (CEST) From: Christoph Lameter To: Alexei Starovoitov cc: Christoph Hellwig , David Miller , daniel@iogearbox.net, andrii@kernel.org, tj@kernel.org, kafai@fb.com, bpf@vger.kernel.org, kernel-team@fb.com, linux-mm@kvack.org, Pekka Enberg , David Rientjes , Joonsoo Kim , Andrew Morton , Vlastimil Babka Subject: Re: [PATCH bpf-next 0/5] bpf: BPF specific memory allocator. In-Reply-To: Message-ID: References: User-Agent: Alpine 2.22 (DEB 394 2020-01-19) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1656375468; a=rsa-sha256; cv=none; b=6527sxXn80ARgnKjVbWQgHglyiEwe9AoFAnkx+bW/ZmdL7IwyDcuHzjGKBJj/TQGhMkiXb smiNUMLD9LD0EzcrPZva1dO2jumGRUmEZQ0qkrwT6TJ5nR8gVLhLD5MirP/MMwBEhSvQwQ Hke1xoDHi6DIepedRGzyK7NpY2+j9Y0= ARC-Authentication-Results: i=1; imf13.hostedemail.com; dkim=pass header.d=gentwo.de header.s=default header.b=erlmz3EG; dmarc=pass (policy=none) header.from=gentwo.de; spf=pass (imf13.hostedemail.com: domain of cl@gentwo.de designates 161.97.139.209 as permitted sender) smtp.mailfrom=cl@gentwo.de ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1656375468; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=SJXCcMcSxSjIoTWs93tG3LqaSSkxWzvsKdPYXR1oFIA=; b=JGJ3qQPVvtY1gF/H55yn3jcpoD548zA7qzD6L6ghwScJYgcJV1OEEFj5NvsmbTQcqhem00 Ewzte9iSleplRe6v6Gwg4w+DHtzN7TtJXl1+Q8t63uDXNd3ybzNPsivvBwNAtuwEeeyUxh HGEIuR7aO7kPR0VqgBqjbMAw1wouF/c= X-Stat-Signature: ueb1pkwtt1yhstf8mudc8njua94m7srf X-Rspam-User: X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 60FDA20026 Authentication-Results: imf13.hostedemail.com; dkim=pass header.d=gentwo.de header.s=default header.b=erlmz3EG; dmarc=pass (policy=none) header.from=gentwo.de; spf=pass (imf13.hostedemail.com: domain of cl@gentwo.de designates 161.97.139.209 as permitted sender) smtp.mailfrom=cl@gentwo.de X-HE-Tag: 1656375467-585054 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: > From: Alexei Starovoitov > > Introduce any context BPF specific memory allocator. > > Tracing BPF programs can attach to kprobe and fentry. Hence they > run in unknown context where calling plain kmalloc() might not be safe. > Front-end kmalloc() with per-cpu per-bucket cache of free elements. > Refill this cache asynchronously from irq_work. GFP_ATOMIC etc is not going to work for you?