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Wed, 13 Jul 2022 20:26:39 +0000 Received: by worktop.programming.kicks-ass.net (Postfix, from userid 1000) id 50F5D980082; Wed, 13 Jul 2022 22:26:37 +0200 (CEST) Date: Wed, 13 Jul 2022 22:26:37 +0200 From: Peter Zijlstra To: Song Liu Cc: Song Liu , bpf , lkml , Linux-MM , "linux-modules@vger.kernel.org" , Luis Chamberlain , Steven Rostedt , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Masami Hiramatsu , "naveen.n.rao@linux.ibm.com" , "davem@davemloft.net" , "anil.s.keshavamurthy@intel.com" , "keescook@chromium.org" , "hch@infradead.org" , "dave@stgolabs.net" , "daniel@iogearbox.net" , Kernel Team , "x86@kernel.org" , "dave.hansen@linux.intel.com" , "rick.p.edgecombe@intel.com" , "akpm@linux-foundation.org" Subject: Re: [PATCH bpf-next 1/3] mm/vmalloc: introduce vmalloc_exec which allocates RO+X memory Message-ID: References: <20220713071846.3286727-1-song@kernel.org> <20220713071846.3286727-2-song@kernel.org> <7C927986-3665-4BD6-A339-D3FE4A71E3D4@fb.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <7C927986-3665-4BD6-A339-D3FE4A71E3D4@fb.com> ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1657744030; a=rsa-sha256; cv=none; b=OCUzApWDz6sOJ399L5clMD++EvLTU/y+zqT70S6qCVtXywWqIVqCckUzo7mabh/1GN2gyQ 9rf8jQ52Kz/meTbJV8Wuqr+Hy7wNoWFCzdknJxt2FxPPdSHgme//XWAl+tWEkEmN50cOGI KMVUtXd2Ms2xglJ6bPxwttPEPdMsAM4= ARC-Authentication-Results: i=1; imf11.hostedemail.com; dkim=pass header.d=infradead.org header.s=desiato.20200630 header.b=dbi9CHnM; dmarc=none; spf=none (imf11.hostedemail.com: domain of peterz@infradead.org has no SPF policy when checking 90.155.92.199) smtp.mailfrom=peterz@infradead.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1657744030; 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=aMwCqCZv7KMm7FPwRBaOPDqNH5Xzn53rKrd3wy7Qd0w=; b=FTg2PNn+V7oRBnLgQnorEw7LGyub0rYSsWcEXeMQlOAffq/EwxOIPiTftMLU+orTrr3Sem IOooi//tD/sfSIqpq10cnP2MHAK4Rzjba6BtwCTmYbc1MD1+4hc0KEF155DaeYtbRGu2Tx qobkAY7lyjvFxr7X2G38dfS613PnGK4= Authentication-Results: imf11.hostedemail.com; dkim=pass header.d=infradead.org header.s=desiato.20200630 header.b=dbi9CHnM; dmarc=none; spf=none (imf11.hostedemail.com: domain of peterz@infradead.org has no SPF policy when checking 90.155.92.199) smtp.mailfrom=peterz@infradead.org X-Rspam-User: X-Stat-Signature: e1jkioja8wnshcj1gxjxtfoujddrjrix X-Rspamd-Queue-Id: 93BD9400A9 X-Rspamd-Server: rspam08 X-HE-Tag: 1657744028-357766 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: On Wed, Jul 13, 2022 at 03:48:35PM +0000, Song Liu wrote: > > So how about instead we separate them? Then much of the problem goes > > away, you don't need to track these 2M chunks at all. > > If we manage the memory in < 2MiB granularity, either 4kB or smaller, > we still need some way to track which parts are being used, no? I mean > the bitmap. I was thinking the vmalloc vmap_area tree could help out there.