From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wm1-f53.google.com (mail-wm1-f53.google.com [209.85.128.53]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EFFDF2DAFD7 for ; Thu, 30 Apr 2026 15:32:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.53 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777563165; cv=none; b=SeJdeAcn1Ya6oYHJ3EBUlVlBFxI/ugnnVDy1FhaNfp0W0TqoCSBsIYTp80MFm70Sx9HWKodKpz7I9uaEngNGinwU0rwZfWGOx7QAcGNc0ZQ/KlqMkRht3wwbLRNyIkbBH7h280vHjfr/V7XZ8stpwMp51Orenuuq7azUJWabPrs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777563165; c=relaxed/simple; bh=agNcnRQM1KgflDt6xn/DOs3Lnq8oR25XzJJr+flipK4=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=THjcSPatYTCt0Mhg/+ZJFUq7hDc5OzZ74PeNXh9VPJuPBD+H7xSr+pPUoAMIvdFGAOFiNuLOWJdhgx7uUt3r2+Viqyd2f3djef+o27AwGioF48FDJpYmxdqmc0gWYrhh93GVswYUuZn36StCxatK8lklFxScFSAapIWPFNUNl2M= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=suse.com; spf=pass smtp.mailfrom=suse.com; dkim=pass (2048-bit key) header.d=suse.com header.i=@suse.com header.b=KjbXAGF+; arc=none smtp.client-ip=209.85.128.53 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=suse.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=suse.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=suse.com header.i=@suse.com header.b="KjbXAGF+" Received: by mail-wm1-f53.google.com with SMTP id 5b1f17b1804b1-483487335c2so12235515e9.2 for ; Thu, 30 Apr 2026 08:32:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=google; t=1777563162; x=1778167962; darn=vger.kernel.org; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:from:to:cc:subject:date:message-id:reply-to; bh=RAMMBWlxuC5VTMg7XRzXOnsHoZnowd4Y/GYGwSPMbqE=; b=KjbXAGF+GRz7/6zyiZdgpaL3ynPtb+eo/SINBlvUlWB1U/WfQ18AAqtNewl9R9na6u K1hLr/YsTG5hAN6JWQeVvSvwKyAJqrK1Ltw/G35pwa2qemiKzlq1Bzya2XLRYEuknq0A CFg+ItLCxJs/dznGr1IhtZkcXJ1IdMvDiSxrSbrXblxjA47u8tF7gED1QvqNgFVtEfMH ++EDOKhSDUt/qoyOqQzZ7/aol5wbzTX+zCnYYOnrE3f+7+Nyt9VDSTJMUu4sjfGe1o0P /9qPKzKXCqwLWMc3fqvK2PzutKlFlQl2aWOlQDnOcHlfi+ZGx5wtLItqqUrrhoD35dRg U3oA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1777563162; x=1778167962; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-gg:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=RAMMBWlxuC5VTMg7XRzXOnsHoZnowd4Y/GYGwSPMbqE=; b=DUSFyJbV9x5IM88TSpdNLKvMLuMfuNMoK6Q5jFXp3bPSHOSHkuLQhnkianGTHlVXs/ 5U8LzfEy/z81SAhvSgSkk8wOfwVHaDWXnyEedVytYDc+t9oDl0GAC5BsAc15+v0Dtv4K acqtx84DLTgas4jmNamv0fKjs0wYGtu0qRiFJFae2RzEfPYWw7C8UolypZ58A2S01L6Y 2rICxNEc1OEzvxPLDlQfmW6xNMdWJ0cg3aJBHIEEIIYMI/uuQJx7S7WLHPS22e6D5daE OoBLGseGrqSiYTp14YN6UEA04O8ZwKHDGQGLA3hs7C8hLXHJVMpUii3ifybcQD/Rl2wM Xzzg== X-Forwarded-Encrypted: i=1; AFNElJ86JTMoi89+H+tX+zZ4qMD1ynmGYgCnmoQlZIMDQyqJbXEqs4AhDFncKUzjNC1YsX+a3uMeUpmLcLA0@vger.kernel.org X-Gm-Message-State: AOJu0Yz/GwGuA9zvTACqBOj23PX9PmQPxzQ3/J0ZgGvrvL2uhVIe4Y1s 0XFdXsCYIUHt+H4o1gbv/nIq4PSXWQi9748ukg08sqn5pSR/gU9Cv4mWuen+ByM5CR0= X-Gm-Gg: AeBDieug0r/04Dp5SjrQkqP64COgZvKXToB8Cy7mvbS+38heq9z3m3O/ONgex+HqHkv lqeac5LgM1E5Rwq2BEX6cVoa0G8wsJ+StDIvJZffZXWzWnFhPu/ZizCyZ9KkEgmbeo8CAoimsE8 5hio5AJh2JXI8HntlJE4Afh4jxYYOzLIOXirmvOHzpo8CZRrH3lrEUi7976bE2clybVFUYO5aBk gVxx8Rf78M6x0t/qxKY7hQjm76yaKGW4Rj/G5L0dqvCpKw1FH8xWrN6bVliqMdp6u4zClHwmppd PGz9xOUldPcwKQ57gnAn/1uLys6IAa69caj6p8psFck6IeQtWvKOe2HJmZgEIn6+HmL3vBTsdJ2 orrZgFNC9qyxlUanevkxMWd4epxD/YcT9oDn/EdzHRdZOkPSpH6VDcXMVWXmZELN1OxAyBmYOIz B/e/zMDglGtGDfMzyNfgnfymwGgpV+wwoBbX40WzzdMRsW2Si4VjMT4Accmw== X-Received: by 2002:a05:600c:8b22:b0:486:fb0b:ad79 with SMTP id 5b1f17b1804b1-48a84524e1dmr57699945e9.20.1777563162217; Thu, 30 Apr 2026 08:32:42 -0700 (PDT) Received: from localhost (109-81-16-145.rct.o2.cz. [109.81.16.145]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-48a81b99127sm70429935e9.0.2026.04.30.08.32.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 30 Apr 2026 08:32:41 -0700 (PDT) Date: Thu, 30 Apr 2026 17:32:40 +0200 From: Michal Hocko To: Andrew Morton Cc: Minchan Kim , hca@linux.ibm.com, linux-s390@vger.kernel.org, david@kernel.org, brauner@kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, surenb@google.com, timmurray@google.com Subject: Re: [PATCH v2] mm: process_mrelease: introduce PROCESS_MRELEASE_REAP_KILL flag Message-ID: References: <20260429211359.3829683-1-minchan@kernel.org> <20260430074305.9d3389ed71af040acfe222de@linux-foundation.org> Precedence: bulk X-Mailing-List: linux-s390@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260430074305.9d3389ed71af040acfe222de@linux-foundation.org> On Thu 30-04-26 07:43:05, Andrew Morton wrote: > On Wed, 29 Apr 2026 14:13:59 -0700 Minchan Kim wrote: > > > Currently, process_mrelease() requires userspace to send a SIGKILL signal > > prior to invocation. This separation introduces a scheduling race window > > where the victim task may receive the signal and enter the exit path > > before the reaper can invoke process_mrelease(). > > Does process_mrelease() have a manpage? My googling was a fail. It does. Very well hidden in 884a7e5964e06 -- Michal Hocko SUSE Labs