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Wed, 09 Nov 2022 09:53:36 -0800 (PST) X-Gm-Message-State: ANoB5pldkPg1bRIwY1wbyeV4LaHPn+p+7nBsaTJmCROxjvN1dNcjRwY6 dkGsUFs6Crka3uK9uloVK6+ABqk7Xg6P9YH6qY4= X-Google-Smtp-Source: AA0mqf4QQjt0kKSyCr5k2IT/Ezjzn7T8jZYVXzl+jehe6aSglRllibKghzaWxJyhykogXsawPRURinneME1WsGumqUQ= X-Received: by 2002:a17:906:eec1:b0:782:6384:76be with SMTP id wu1-20020a170906eec100b00782638476bemr7600535ejb.756.1668016414461; Wed, 09 Nov 2022 09:53:34 -0800 (PST) MIME-Version: 1.0 References: <20221107223921.3451913-1-song@kernel.org> <9e59a4e8b6f071cf380b9843cdf1e9160f798255.camel@intel.com> In-Reply-To: From: Song Liu Date: Wed, 9 Nov 2022 09:53:22 -0800 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH bpf-next v2 0/5] execmem_alloc for BPF programs To: "Edgecombe, Rick P" Cc: "rppt@kernel.org" , "peterz@infradead.org" , "bpf@vger.kernel.org" , "linux-mm@kvack.org" , "hch@lst.de" , "x86@kernel.org" , "akpm@linux-foundation.org" , "mcgrof@kernel.org" , "Lu, Aaron" Content-Type: text/plain; charset="UTF-8" ARC-Authentication-Results: i=1; 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dkim=pass header.d=kernel.org header.s=k20201202 header.b=fYKPHc6U; spf=pass (imf25.hostedemail.com: domain of song@kernel.org designates 145.40.68.75 as permitted sender) smtp.mailfrom=song@kernel.org; dmarc=pass (policy=none) header.from=kernel.org X-Stat-Signature: 8sgtwmdtwmfnyintfb7d7t67iqxgopgt X-HE-Tag: 1668016419-595030 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000007, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Wed, Nov 9, 2022 at 9:04 AM Edgecombe, Rick P wrote: > [...] > > Similar to the perm_alloc() hacks? > > > with similar rodata_alloc() that uses yet another tree in vmalloc? > > It would have to group them together at least. Not sure if it needs a > separate tree or not. I would think permission flags would be better > than a new function for each memory type. > > > How the caching of large pages in vmalloc can be made useful for use > > cases > > like secretmem and PKS? > > This part is easy I think. If we had an unmapped page allocator it > could just feed this. Do you have any idea when you might pick up that > stuff again? > > To answer my own question, I think a good first step would be to make > the interface also work for non-text_poke() so it could really be cross > arch, then use it for everything except modules. The benefit to the > other arch's at that point is centralized handling of loading text. AFAICT, most major archs are introducing text_poke or similar support. What would be a good non-text_poke major to look into? Thanks, Song