From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wm1-f52.google.com (mail-wm1-f52.google.com [209.85.128.52]) (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 B2F01320CA0 for ; Tue, 25 Nov 2025 12:55:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.52 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764075330; cv=none; b=b3Ev5z4FiHUIw92JS3mQRNuRd6K90v/VVaEOBG67BIADgULGo6PzUBkLftXV8AE271Vh1MFfO/KL4Q0h8tjyW4lZe4RI3Qt5mpSqv1nrRUYlGrtQ8/cwqbT3NfGpyWWQBCYoL/eGSbssOKKi4igrRdUo/Y3cnSlJPW6SW6Bin2k= 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=209.85.128.52 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-f52.google.com with SMTP id 5b1f17b1804b1-47118259fd8so48005905e9.3 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=B/hpe8MU06coy4v50oDhreQwpNlWTzCaiW+0pB2Wfyadx+hcDJIIeYv6z54AInKz2P XA2XYVqRaj8l7020spIiyHWrT8prM4mGh4DP056oNo+A3ZD7Hk7/5wNmpq64K8udJVSU pML/A/E/f0atndCcdSCW84IyLqfzJa1AdY0NAgpj5UxCm/HMnDlqTHSgzrLZR1eE+OO3 F+T79GIlwIyHJ7LK/rV/hkJQkjGpYN99NiY8LUsWx6L89LF72iAiD3sK7gCa+0KC3tyM stN82e+Q8hGOygeD3CGfuDzcJNIO1HoNq45PaLVU253gkResr2QqnQgs+WtxzRwgGEuB 2Lbw== X-Forwarded-Encrypted: i=1; AJvYcCVXjC4SzG6qpjm0Jv52ZUZd0ZMiSHsVndr819uSRPIx2L2CmgZ/Bz8Tv+H++C5JFVdkUSQ=@vger.kernel.org X-Gm-Message-State: AOJu0YyFrGsDlsBFklYoTMYrxk19sKSMag0ldbyINhJBfiETBBHTCRW8 OBy5/C2aITfeC0qwQR1nh1JWJRgqG6VbnyPOPUzQ8HoPxrncgOsnOMD6ftL59jIGZSI= X-Gm-Gg: ASbGncvSQhBwXPuEtuzOfcJAc7tOQp9t+sVh01FxPCzVRlLD36J8oZZ+NN1sRYMB5Cr 5du+iUrHfEG+4m2cRXVHRwsEkihd4y8YwOE5I0zXQLpUuAOEO8nBrzV3lQhvigtmni/O7GbEH5p JQqvV1MWOe7/uqIwAhc1A54hkj/T5GTtWW6nzTg0BMQ28YMmhPuCGR0kWTiDzmvqLM2UKQqVmMS hJEJ164KS1d4vXozSCCtNjl/DVoC7bhqqeEojW4KsrmqlRyvfpbpoLA299hnKDlAk27ZE8cpozy XoISqxX6ZgPj3+nIxFIIb8zRQfFb965sbA4OSYf36gNRIM1R0oL257JwOVJpOu8rI0zDfxYa3in J6fFGOtdP9Pgs+x6fdckISBLzAFJTVrTekotB3g7fRZf/Y/1JeZ0Y85uayezi8OZwooaRRxH/Kz dNhSOVllUtIrx5TcLB/AGoWiN6 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: bpf@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