From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wm1-f54.google.com (mail-wm1-f54.google.com [209.85.128.54]) (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 BB3FF320CA2 for ; Tue, 25 Nov 2025 12:55:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.54 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764075330; cv=none; b=LVi4lYUeL7F3FXFRssT2Q78VUoG7S+ZAEgu/Yrznw6m21O1tfRTGbh1FADQO6i9n1/I+b5gkU5gectkc79602Wc03JS5wxQUIXE9f/YuvX776pY+r49ifE/GGIbXqpPpYBpJqovj9n6ZOSYPQOf8NAglLTTbyaSFX4YZY2sloHA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764075330; c=relaxed/simple; bh=TcIehyyg9NOgFB+aqxQUl1XQcbzEAynNMvyg8CX0Iz8=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=dHfHUVbzj/3uB5PM+TsN0ns9PI5LlcTqlJ63tvEcpAAVjG5mHzxCO8pSXr4vSWTwHsF3bOMqcnQOKPVti/iYxyyNp5mGiLiYtQ36ENEWr0PbWiKew28CXwj53BhZxnjDjo/LmOhzd8WtGbk5vR721v1lbcc3A87PtnLsf+6UlRM= 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=CxbVjZRH; arc=none smtp.client-ip=209.85.128.54 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="CxbVjZRH" Received: by mail-wm1-f54.google.com with SMTP id 5b1f17b1804b1-47118259fd8so48005925e9.3 for ; Tue, 25 Nov 2025 04:55:28 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=google; t=1764075327; x=1764680127; 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=usCzcCtVI6XgCiCu4NS8NEIAX55CiKwZAm0iUXb+TsA=; b=CxbVjZRHmdeNmVkpr656+7d2ejK+CRH5xbGN7WoQ1OQ6RSHHh4OemSB+Ts4ZVLydJa i+P2cmzrjX+PHuVDpSmB/Rm9YpkTSjr/pqoFg8pmTCY/FU1MR7Fkzv6of1c8WVTwAWZC 135wz6s+2WNVkWja+VN3+41e2gX8oILAA+CmXxTzb2eCA8TN6kSPJSsa/CAGpSao6x/E 366acJ67JjjaSN/7Qo7z6pX4zvh4Blwk1y6BDbdG83jvOAAFht2r91fp8EcdeKpQGh6W B8EslKrt8PU6/IWPUadQR1+AT7OaBclYJMHoYdCaXlDof4m/Z7u+f4TwtlnX1jH6KJW5 CXMQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1764075327; x=1764680127; 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=usCzcCtVI6XgCiCu4NS8NEIAX55CiKwZAm0iUXb+TsA=; b=hHWc4Ji4GHuxhOnlK39yY3RTs4qex3msGc4NBD09TB7BB/L9/OgvlDxRSlISnk7ene 27ATMekuHho1zP9i8Y1SN5i9dMC+qBw2tPd0Ki3+q9jEUwZpoXMfmbS3vgOoHEZ+X7rS HO9gcM8tZN8+wXW5TbTrrbj5C8+m0aKnHpoIlJoIgd9WFAOb9VAA+WVXZL0379S0kdHe 7oLOG9Oj8ceIkm6yvY5aq7P9ZulPUvWpvuV8cCprdg/bl8GIohwazKHPqS1fIMotK8jW Y7cwDbtV5sT2jSgtRkfi41zdQbyh3YE77hJU4cb3pS/rUZ8JC+7k/0VRs5CNDvdNW+8K 35Kg== X-Forwarded-Encrypted: i=1; AJvYcCWJMFbK6jeBStGQJFhbouAtzY0ixcvmIEFq41dJd70u5HkMRze2HvSjDWWLSxPQ7xBSvVxW55Q0gmnWxRg=@vger.kernel.org X-Gm-Message-State: AOJu0YwiKm2LKMuyGHdAfq0/WZ4Fs1e0+/6gZpsxxk5UvXEzSWvDn7dX Rf163Lhwq6V2nU76FLhSscms9OHO3r1M2kEnhkiFWCpsl6hYAyz2l/BEIOMGekggDnE= X-Gm-Gg: ASbGncut92ZxTlVntELPHSOdla0PtcJW4i0nKR3teZYaqBHGck7ihhx9dxOD0zXzxQ3 jHf3D2sozEKR2W6GAk3GeZ1jSYiI23srcqtzqJ3w7GBTZOSeRUy+xif8ZhwmuAD7QWO7cmcWTSn YHJLu67btMs9kwtwuSe/s/VylxY0Xv5sVEdixL2IiAkmknOoRtLgzEJldkr6pH8uvmBh6rdodYA Sfa8N60EsYF8rM3M7OSEWoUHjzaEQWab14l6Fmkz883f16fUbOK3MmqCKSvhK9JN1mhpisjvH8i jMXYsOjDu4mNI6zdnDASFzjFSU5VwX4oVw7kPIWWsJUcQsB9XR2lqbjtCFd2rE0A2CbipqgTo4M MaugbjUAeyG77dK59jWhUxzBDtMKBqZ4kc/u0T2TllTDXxEyuuUvEw+dlNWZa6cQX4kUZf5trzB i8Lhw+wx1vyTNiU0NKYitQVtaa X-Google-Smtp-Source: AGHT+IHeNFHz77PnS9U9y/LXSC6SdqMAwMHknNtAmvznPS8Yog8Q67/4L/1KHix1NRlDrhL8Rpv3qQ== X-Received: by 2002:a05:600c:3112:b0:477:b48d:ba7a with SMTP id 5b1f17b1804b1-47904b2b2e0mr24822815e9.32.1764075327005; Tue, 25 Nov 2025 04:55:27 -0800 (PST) Received: from localhost (109-81-29-251.rct.o2.cz. [109.81.29.251]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-479040bd209sm18794505e9.3.2025.11.25.04.55.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 25 Nov 2025 04:55:26 -0800 (PST) Date: Tue, 25 Nov 2025 13:55:25 +0100 From: Michal Hocko To: hui.zhu@linux.dev Cc: Roman Gushchin , Andrew Morton , Johannes Weiner , Shakeel Butt , Muchun Song , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Eduard Zingerman , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , Shuah Khan , Peter Zijlstra , Miguel Ojeda , Nathan Chancellor , Kees Cook , Tejun Heo , Jeff Xu , mkoutny@suse.com, Jan Hendrik Farr , Christian Brauner , Randy Dunlap , Brian Gerst , Masahiro Yamada , linux-kernel@vger.kernel.org, linux-mm@kvack.org, cgroups@vger.kernel.org, bpf@vger.kernel.org, linux-kselftest@vger.kernel.org, Hui Zhu Subject: Re: [RFC PATCH 0/3] Memory Controller eBPF support Message-ID: References: <87ldk1mmk3.fsf@linux.dev> <895f996653b3385e72763d5b35ccd993b07c6125@linux.dev> <6ff7dad904bcb27323ea21977e1160ebfa5e283d@linux.dev> Precedence: bulk X-Mailing-List: linux-kernel@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: <6ff7dad904bcb27323ea21977e1160ebfa5e283d@linux.dev> On Tue 25-11-25 12:39:11, hui.zhu@linux.dev wrote: > My goal is implement dynamic memory reclamation for memcgs without limits, > triggered by specific conditions. > > For instance, with memcg A and memcg B both unlimited, when memcg A faces > high PSI pressure, ebpf control memcg B do some memory reclaim work when > it try charge. Understood. Please also think whether this is already possible with existing interfaces and if not what are roadblocks in that direction. Thanks! -- Michal Hocko SUSE Labs