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Tue, 15 Nov 2022 13:54:58 -0800 (PST) X-Gm-Message-State: ANoB5pn3AXe6x51qRRDSb7TrBp+uV8bWtZHoliV41qMFDOeyVi2gq4qX yZf50Iw+cnTCkE8bYomtqTnMgOpRMmlt6rs/OFE= X-Google-Smtp-Source: AA0mqf5a/6rdvupjvmUGbpWqbD57+Pf89dMK5ea/DHCCSjfoGocpQnumMVMIn2mRWl6RBaN5UJMEJroIEbZzcqgMeJk= X-Received: by 2002:aa7:c684:0:b0:462:9bc2:d039 with SMTP id n4-20020aa7c684000000b004629bc2d039mr16900435edq.127.1668549296786; Tue, 15 Nov 2022 13:54:56 -0800 (PST) MIME-Version: 1.0 References: <20221107223921.3451913-1-song@kernel.org> In-Reply-To: From: Song Liu Date: Tue, 15 Nov 2022 13:54:44 -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: "peterz@infradead.org" , "linux-mm@kvack.org" , "bpf@vger.kernel.org" , "akpm@linux-foundation.org" , "hch@lst.de" , "Lu, Aaron" , "x86@kernel.org" , "rppt@kernel.org" , "mcgrof@kernel.org" Content-Type: text/plain; charset="UTF-8" ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1668549300; 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dkim=pass header.d=kernel.org header.s=k20201202 header.b="qr3500K/"; spf=pass (imf10.hostedemail.com: domain of song@kernel.org designates 139.178.84.217 as permitted sender) smtp.mailfrom=song@kernel.org; dmarc=pass (policy=none) header.from=kernel.org X-Rspam-User: X-Rspamd-Server: rspam12 X-HE-Tag: 1668549300-191535 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 Tue, Nov 15, 2022 at 9:34 AM Edgecombe, Rick P wrote: > > On Mon, 2022-11-14 at 17:30 -0800, Song Liu wrote: > > Currently, I have got the following action items for v3: > > 1. Add unify API to allocate text memory to motivation; > > 2. Update Documentation/x86/x86_64/mm.rst; > > 3. Allow none PMD_SIZE allocation for powerpc. > > So what do we think about supporting the fallback mechanism for the > first version, like: > > https://lore.kernel.org/all/9e59a4e8b6f071cf380b9843cdf1e9160f798255.camel@intel.com/ > > It helps the (1) story by actually being usable by non-text_poke() > architectures. I personally think this might be a good idea. We will need this when we use execmem_alloc for modules. But I haven't got a chance to look at module code in great detail. I was thinking of adding this logic with changes in module code. Thanks, Song