From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi2-f13.google.com (mail-oi2-f13.google.com [74.125.231.205]) (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 7EEF24E1C7A for ; Wed, 16 Sep 2026 21:05:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.231.205 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789592764; cv=none; b=jpSwKfLAW9cYW/JAWMkoeCK1mNTi7koi6RMxh+YuPu32InMz33pmCneb6C/AQ3I8Wi3UGLkbVAgFxsedwjcjUtWs5F+JK1SI4RObI9WyRiql4G266DsKODF7Ysr39YDx4FeCYPa5rRSeEvcdsVhZZEXYkUU5dt06HWoM3Ue45eU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789592764; c=relaxed/simple; bh=IQNpo0voZl44flDTr/7bJrTih9RnNbJtVb25BrCwX4A=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=dlrUn8LaD7xFjY2Bmg4ysDamJrUfRXYJ9NFCacG/TO/Dp7+PxdjJzyYtpZLkckTtmt2XfbaUpkU/Udeslu6eQVLG9cPT3T4KJghqGIu771bff+QuKb23nt741KnUt1amfjNd04gLepZKBXg8DqYc1AT1QCQAXfGZjklvUWJsdCA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=aHPK4bAu; arc=none smtp.client-ip=74.125.231.205 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="aHPK4bAu" Received: by mail-oi2-f13.google.com with SMTP id 5614622812f47-4b37a3a9768so157374b6e.0 for ; Wed, 16 Sep 2026 14:05:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1789592757; x=1790197557; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to:content-type; bh=KzgD7tpJ/TV5FYPH6ulvzWsXqYOY3DYINqe8nFmUw9M=; b=aHPK4bAurX8scni84dKccg0rLHmPsoLmjjaVuhlPtnrHrP1Rko8oJF3wSb15S0yMcW AlAlcHXG3KoTvbmi78oLTlkFhwWeMdc0DxHLc56WPvrdRnb0LbjtAGtKauHFtgjx5zAG W8FXOB3CttFaKBpaWmRw4n4gwDQR5Q3qnnzqjqvUZE97gs31dBjswkrvdEaLFmkvZz6m LYzfqNui6IUWxlBJUZWPWf9mHTPHYy9Q5mRpdiaHClVSqEP7Go/6A8C2muguFQZbuod+ +TKahYvAsVSaaYqD+NZ1abceH4BWiMGAnWUSHz7VX0AUMPV8hv+t+CfWPeO7N2jAlF9f +dvQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1789592757; x=1790197557; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to:content-type; bh=KzgD7tpJ/TV5FYPH6ulvzWsXqYOY3DYINqe8nFmUw9M=; b=QjU7t+74QRzjSxphE7nnbbE+sv4fKUg1DG/K7lctu0W27kJx2sjr6xKNL+So2nbaWU 0ofLD03zrwJ0UZ1FEXCbEfG7XD4xSvRFfPwl3cv1os2RCzyAOg7qaWOsqdediRB7Putx D+cjssdxX3XBwkAGrhkWoEDW/43PvGqFADWdlyycvYfd7Ip+mRHuWaQSHXsQm6kuFFd3 AaD3TjkKfr0J8aYXquArqjGFeeDdeqxw8SBLEWFGYdOKb+fsUb67kZ6RxWKpovaQHkn+ UFwU3A+QAvM6PuZMnVMy3RHsL+nDn4UmmggBTp1Q7Q97FYm2ljxPlZpAqFsIv0IpZNKL Nn7A== X-Forwarded-Encrypted: i=1; AKwUvBx/X5cvMm8ubuxvZkmcqcpv1ueKHAcQsYA2s6s7L1LvsgLtmFcS+2KeH5g5HBySu8KDHgqocxbLMHncyYk=@vger.kernel.org X-Gm-Message-State: AFuF++lZM6bv3TFb5Rd/K4q+BUBCcQwhoU7Yi+j9YqIyIluDi7aJR9lR Tf1MkvPH+RbR3kDSeP6Iu4nsmEGGG06uR90DD83r2/FuRiQkSveEP4Um X-Gm-Gg: AYBFou2ObBIkOTrwqx7yJR/pZGKbPY5SZzGuqHt5z3V+yRYH93eShb+l25Odd6jycCs FmQ9Dhikk++cG3j1ju7q0zld9vfNYV+/SQ3e3bhm5j5y41becic9ezDHdgdvQFGjW6fQUEOUCJG SpjtgSyNNyt9AOHjNT/Uf/bBDZfFTkTxjzWJ94RYK2EqckJlkUQbaXgxvyUZ/qpRJTVobob++LS y//rhQvG8SF2Rg3MgTlv1kUd5O0mnK2dziGTSZsPOMWTLX1eJA5zO9NhqUGmpMIGwqYRhOpS60L 61s1KSqDVZjOZSoXt4RPXm8Io9R9Y2uHtbbLowxiKqXZYJC4JWWrcXGpNL+HfpWUChtXFSPqrmw dZOsQFNga73mRXEMY7+Nb5yRyL9y38r0Pj/3ADjirSNVKqomXBSP+sdJedC4wxh1pa0LuMKQGoB cgssNQzbgk1y43NKxGrBAcTn05C5GhTiIAqcY2TtVDs3kv+hhxAljds4QHlvuQ30WQfd9UMZC1t CIzn1rg9+Pr/HS4UVv/iCmX7OUs5Sfg394QimRf X-Received: by 2002:a05:6808:1a0e:b0:4c3:7695:1177 with SMTP id 5614622812f47-4ca497b2b58mr4346226b6e.6.1789592756726; Wed, 16 Sep 2026 14:05:56 -0700 (PDT) Received: from localhost ([2a03:2880:10ff:4c::]) by smtp.gmail.com with ESMTPSA id 5614622812f47-4cb6d796b64sm891126b6e.15.2026.09.16.14.05.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 16 Sep 2026 14:05:56 -0700 (PDT) From: Joshua Hahn To: Johannes Weiner , Michal Hocko , Shakeel Butt Cc: Roman Gushchin , Muchun Song , Andrew Morton , David Hildenbrand , Lorenzo Stoakes , "Liam R . Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Maarten Lankhorst , Maxime Ripard , Natalie Vock , Tejun Heo , =?UTF-8?q?Michal=20Koutn=C3=BD?= , Oscar Salvador , cgroups@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, kernel-team@meta.com Subject: [PATCH v6 1/5] mm/memcontrol: flatten try_charge_memcg control flow Date: Wed, 16 Sep 2026 14:05:47 -0700 Message-ID: <20260916210552.891730-2-joshua.hahnjy@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260916210552.891730-1-joshua.hahnjy@gmail.com> References: <20260916210552.891730-1-joshua.hahnjy@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Refactor try_charge_memcg by flattening the nested memsw/memory page_counter operations to separate the logic between the two. When page_counter_try_charge is made stock-aware, this flattening makes the control flow easier to follow since each page counter now has its own success/failure paths. No functional changes intended. Acked-by: Shakeel Butt Signed-off-by: Joshua Hahn --- mm/memcontrol.c | 19 +++++++++++-------- 1 file changed, 11 insertions(+), 8 deletions(-) diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 1460cba53588e..48c475909e6bb 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -2707,18 +2707,21 @@ static int try_charge_memcg(struct mem_cgroup *memcg, gfp_t gfp_mask, batch = nr_pages; reclaim_options = MEMCG_RECLAIM_MAY_SWAP; - if (!do_memsw_account() || - page_counter_try_charge(&memcg->memsw, batch, &counter)) { - if (page_counter_try_charge(&memcg->memory, batch, &counter)) - goto done_restock; - if (do_memsw_account()) - page_counter_uncharge(&memcg->memsw, batch); - mem_over_limit = mem_cgroup_from_counter(counter, memory); - } else { + if (do_memsw_account() && + !page_counter_try_charge(&memcg->memsw, batch, &counter)) { mem_over_limit = mem_cgroup_from_counter(counter, memsw); reclaim_options &= ~MEMCG_RECLAIM_MAY_SWAP; + goto reclaim; } + if (page_counter_try_charge(&memcg->memory, batch, &counter)) + goto done_restock; + + if (do_memsw_account()) + page_counter_uncharge(&memcg->memsw, batch); + mem_over_limit = mem_cgroup_from_counter(counter, memory); + +reclaim: if (batch > nr_pages) { batch = nr_pages; goto retry; -- 2.53.0-Meta