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AJvYcCU8hl96QkC2rOXjcvT5TrLT+dUD4SS/WL5MN8LpriPHky50xJGLYhnZJEK3Qom96b7VwCnxi+c0WA==@kvack.org X-Gm-Message-State: AOJu0YzGs3YNv5AlKx+Qt/01b6lUELdLea84mXijXdi9DFVqNvv/bPQp N3s3D5iwH0bfOYHRN3Vmo3PLLw6lvXVI8lfr4kqnvI3DSxhh65st7rbzjXPYWNKu5//Gp0MdVKp aj8lQ570bQgQR/+kh9pYOA6ifxComxjlAFtQT X-Google-Smtp-Source: AGHT+IE7gils5dchqxLzswDymXiO7GZKaEJDtRm02srfhsgdKLYaC66intvMGKji2i5s80Xv/NfIMR0nDZOW3ySBN9I= X-Received: by 2002:a05:6102:41aa:b0:4a4:878a:e3b7 with SMTP id ada2fe7eead31-4a8cfd4de79mr4048886137.22.1730059422127; Sun, 27 Oct 2024 13:03:42 -0700 (PDT) MIME-Version: 1.0 References: <20241026033625.2237102-1-yuzhao@google.com> <20241025212448.b1a9069d71df5b497e1b0190@linux-foundation.org> In-Reply-To: From: Yu Zhao Date: Sun, 27 Oct 2024 14:03:05 -0600 Message-ID: Subject: Re: [PATCH mm-unstable v2] mm/page_alloc: keep track of free highatomic To: Vlastimil Babka Cc: Andrew Morton , Link Lin , David Rientjes , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Johannes Weiner , Zi Yan Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 87E8D14000D X-Stat-Signature: hjf9iwgnbt9qi57j1ad3nw8qiyp8mmfh X-Rspam-User: X-HE-Tag: 1730059407-782086 X-HE-Meta: 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 FGhZuGSX Zo69GdrjA6Yfxjkqqo2m5nlzCnSIZq+dYHcpf0AvFHJaTZgOmEDvG+v5mprdf4BV+frQ0AXbxtV2CofREtVONk/tODecG0M4zjaqD7FoFpRW3719nooOnj3nOMQYaTFafoYuBmK749hTN6X2N9hIeIknXFk5Mamp7p+Scy/nMXnOI6qyTCw8qEVMOieTmipjhwZnt71SmjztaRJhkr1V5+mXzf/kgSvhjeXgvEvXUfCT2OdTns1AM4RAhk++kHVjMJ/WEWmsMtz/ptWM9re/vFc1u7Qb2aZA5a0nR5OjrKDcUTVU= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000001, 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 Sun, Oct 27, 2024 at 1:40=E2=80=AFPM Vlastimil Babka wr= ote: > > On 10/26/24 06:40, Yu Zhao wrote: > > On Fri, Oct 25, 2024 at 10:24=E2=80=AFPM Andrew Morton > > wrote: > >> > >> Is a -stable backport needed? > >> > >> If so, is a Fixes: target identifiable? > > > > The code has been there for many years, and we only recently noticed > > the problem from Link's repro. So it doesn't look like a stable > > material. > > The stable backportability would be limited as there's a prerequisity on = the > "mm: page_alloc: freelist migratetype hygiene" patchset from half a year = ago > - patch applicability wise and importantly functionality wise. I don't see any dependency to that series. > Otherwise the > counter could drift easily. Care to elaborate how that could happen? > However we could perhaps mark it for a 6.12 stable backport as that's > presumably the upcoming LTS. Right.