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AJvYcCUcjbBWmNRjqFr62r4R3K+7AFM29td3jhg9VXk8fgLoufYSGHLJ/O+Xs2OfBl087CUrVavX6Xfxjg==@kvack.org X-Gm-Message-State: AOJu0Yw//M3vRHeacdB53i426E8/HTi8bLDrRqvBlE1ZesDYr8OIfsKq LaOxsADXAA7WdHXE7dv3CsSsv4KqgySb18HgiAiCkBwIqgCvY3kkFXrt6AaQ2PBrE0uOueh6NiY HM18nl87MH2y0YQcvjhekU5HEij8= X-Gm-Gg: ASbGncug+0LCtkuWPVyrX3vBx0Vj3SXuZQXsvKM9jRbqedZ3YyI5mIwnEz2UAi7cBfp Q+bHvZvYTQ2SfQYfwRhh79/pZL37V3zOw0kMZtStC25aNBb291dj0fw== X-Google-Smtp-Source: AGHT+IEHxD5tDF30UTHPuEmFS0lLv/rpE46aiB0cbj0uY+4Ltf+aPw2fPOnrnDGbXjxrvuxgL883HyguoZTXcMQ671Q= X-Received: by 2002:a05:6000:1a88:b0:38b:ece5:5fe4 with SMTP id ffacd0b85a97d-38bece56cb7mr194224f8f.1.1736980446207; Wed, 15 Jan 2025 14:34:06 -0800 (PST) MIME-Version: 1.0 References: <20250114021922.92609-1-alexei.starovoitov@gmail.com> <20250114021922.92609-2-alexei.starovoitov@gmail.com> In-Reply-To: From: Alexei Starovoitov Date: Wed, 15 Jan 2025 14:33:53 -0800 X-Gm-Features: AbW1kva-ZkzMxsQ3qqhYQ1yxPEzA3vJvyYUvoRdZ9pBIgeH_JNx3IW1FBxhOW8s Message-ID: Subject: Re: [PATCH bpf-next v4 1/6] mm, bpf: Introduce try_alloc_pages() for opportunistic page allocation To: Michal Hocko Cc: bpf , Andrii Nakryiko , Kumar Kartikeya Dwivedi , Andrew Morton , Peter Zijlstra , Vlastimil Babka , Sebastian Sewior , Steven Rostedt , Hou Tao , Johannes Weiner , Shakeel Butt , Matthew Wilcox , Thomas Gleixner , Jann Horn , Tejun Heo , linux-mm , Kernel Team Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Stat-Signature: cesc75qws9b1ewh4k47mf13p81tjxxck X-Rspamd-Queue-Id: DCB00120005 X-Rspam-User: X-Rspamd-Server: rspam06 X-HE-Tag: 1736980447-60536 X-HE-Meta: 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 00oHbXiT X+hHNG2Q+a2SVfkcKF3xMzAYMK4+Fbf6JbbMk+fBYQ4iXvTWAx1LjUMsxfMbeJuyv3hiQV5mn2AItbowH+J/m8QY6G6ERNWcDFVoroKqn8Dz2JTX0c8saSYu47Q9klLA7vgKTY+OkGlhFUMUcgWIUn2OVoGdtv5OvwRdP4spDboVGHdoaQxRBqcd4OIPaW6ULy3K387qRFL4PFvJwvysWY+amDkZm2lhyaurZQiZcItc3TC7WkKx8ZGaNW5za5KHt6lr1eDqpZun/xzGMYiywUfZcdlV/oJDVnIsFRRFF4OjX/gmin2zXRDcj0CN8cNliaaFKFDowwI3jJPw1i4SbaXjTC7TITFsVC2uAEmVzZDOUZL29NG7ZxoDYQJ/P5UeCzF1+xUfwTBd5Eai7Ip3nEpmDedaIMt8AoQT4nWTZqRxpX+2vC3H3cTjE4wmCpStQMZCN835fhDOSohvFwXGUUXmin2wtDoWaWfEm X-Bogosity: Ham, tests=bogofilter, spamicity=0.000115, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Wed, Jan 15, 2025 at 12:35=E2=80=AFAM Michal Hocko wro= te: > > On Tue 14-01-25 17:23:20, Alexei Starovoitov wrote: > > On Tue, Jan 14, 2025 at 2:31=E2=80=AFAM Michal Hocko = wrote: > [...] > > > LGTM, I am not entirely clear on kmsan_alloc_page part though. > > > > Which part is still confusing? > > It is not confusing as much as I have no idea how the kmsan code is > supposed to work. Why do we even need to memset if __GFP_ZERO is used. kmsan's main objective is to find uninitialized memory access. So when the page is initialized kmsan needs to notice. It's similar to kasan_unpoison logic.