From nobody Thu Oct 2 15:34:41 2025 Received: from mail-pf1-f201.google.com (mail-pf1-f201.google.com [209.85.210.201]) (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 3D84E298CC7 for ; Mon, 15 Sep 2025 19:52:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757965957; cv=none; b=PmoUMKcTzZTS+lUS9pQgRuFzWQTypqjEkIW3MYIDO6uRHVvWNs4ta8tda223mFZI6uoL8fMM9woOcf2hlyD9g0P8yZFhPKkqlq7+ShWHtyPaTC2A/4D+NVLOqA6cIOntaGFbMh1GFygRLYp5NA7hkA5WVsU8WeZnUrTccHGKOOA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757965957; c=relaxed/simple; bh=aKMdDFEMo/oVD6fE5n37VpWwZBts1CGWoQryXnCpJOA=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=pg+rGECRn5kylFxRP5lCVAsrLAdHTESbNmav7I3fZBtxUMa0FGa0okYE1b4r0m6F2ELK+FlHwrGBRHN7/8wFqO4aza7OdwJAQNlQS6obWxC9vJr0p52U2Idp++1Qc1p4HPv3IpN8OX5QLQ7n3KDVnGD3PlnF5j8YLctzTIYGwf4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--fvdl.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=MXMXHrIP; arc=none smtp.client-ip=209.85.210.201 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--fvdl.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="MXMXHrIP" Received: by mail-pf1-f201.google.com with SMTP id d2e1a72fcca58-77422201fd8so3846143b3a.1 for ; Mon, 15 Sep 2025 12:52:36 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1757965956; x=1758570756; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=W+/YCFUq0Yen9BegMvuM42I97kIDxgCZBi/LyO4DIQY=; b=MXMXHrIP7R7cskyC29tITw7ljpYYDVtJiJS8oMP9zXIRi3uVwVeLsmfpFI3DFYxtNL efuEbSUoP1jMOeEDATMjSoH+nrkr09s4VMnMEwQlDO2x3KX6cfjpHVxRVBYeMtsTN5xF VTvXdd8w8E+ygftuzu3PyKwGmKiXe61h0HJMKYlvfyOt3Nhprefjf/CRPMEVN3msZlPj q7QGdd+ElFRWc0mRJ3btRCI0AxhGll57FZEEcniofwAHq92WyjSoOcCdifn9bfwXDI5n oG6G6e0gl+jxtadaWE/CBsHNW3scmDF1ADpzCnUUSXDPPDxBolX/YPhNILnOqt6/WbiF 52ew== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1757965956; x=1758570756; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=W+/YCFUq0Yen9BegMvuM42I97kIDxgCZBi/LyO4DIQY=; b=JXg5IbvoYN1hxFU6bRWk+oOj/pINXwrLwLpUiVGjXY+Gh08wZ+6GSLb43NQ2ZYVRZR 1frLzFf+gxKxqSUUpBP+YYNOhWEh8WB23SsFIWlXvOYKeowK5nP6jP6qIU40D2RwdvTF 0zlHqkk/2z9niHXKS95Y0MrKUu0Qc/xOcD8vUEIUCNF/ryHMplQnZuxjWnbWWJ1TpuBo SRobj/QejlMyLDkZxNpd/Cmoj/gf5DI3n7OJiyLrnFr5Z9YMDxMOTYRq5reRGNjKZAjj HTGjAG+4TGJZqRnQpicNOZY00ymW0Or50mbjbT5+QKINef0LL3272uStGTybA1qNdz39 9t2A== X-Forwarded-Encrypted: i=1; AJvYcCUDrntvNWCj0jOwLsnhx/Z2xGN8aG/wWFg4Quts1MoSINnrkVAcrzlIwjkGqxzL6H4E6kxhk2iwjCanZW8=@vger.kernel.org X-Gm-Message-State: AOJu0Yx/wLhWk0kSU2o5G3uubqTb+as0A1D1ICb7Ydp6opVlP4UgzrQP yaFqeD96I17oL2PVtR+f5BOB/XDYEEzUn4EvSYYIezK8Qf7th0kRQ63O4S9y8VKnyh1/uSBiMg= = X-Google-Smtp-Source: AGHT+IELU+Ic0v9pK24z6KtPtYVZqHgqvjb+y/T+z6SpzU6YQC5S9+eHZfr6wIXl6+CEbQ7nMg5OLJCk X-Received: from pjab9.prod.google.com ([2002:a17:90a:1009:b0:32e:d02:d541]) (user=fvdl job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a21:6da9:b0:262:6310:3fb9 with SMTP id adf61e73a8af0-26263104373mr10578957637.34.1757965955716; Mon, 15 Sep 2025 12:52:35 -0700 (PDT) Date: Mon, 15 Sep 2025 19:51:52 +0000 In-Reply-To: <20250915195153.462039-1-fvdl@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20250915195153.462039-1-fvdl@google.com> X-Mailer: git-send-email 2.51.0.384.g4c02a37b29-goog Message-ID: <20250915195153.462039-12-fvdl@google.com> Subject: [RFC PATCH 11/12] mm/cma: rebalance CMA when changing cma_first_limit From: Frank van der Linden To: akpm@linux-foundation.org, muchun.song@linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: hannes@cmpxchg.org, david@redhat.com, roman.gushchin@linux.dev, Frank van der Linden Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" To keep things consistent, rebalance CMA when changing the cma_first_limit sysctl. Signed-off-by: Frank van der Linden Reviewed-by: Rik van Riel --- mm/page_alloc.c | 20 +++++++++++++++++++- 1 file changed, 19 insertions(+), 1 deletion(-) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index dc59aaa63ae6..da1cab63995c 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -6640,6 +6640,24 @@ static int percpu_pagelist_high_fraction_sysctl_hand= ler(const struct ctl_table * return ret; } =20 +#ifdef CONFIG_CMA +static int cma_first_limit_sysctl_handler(const struct ctl_table *table, + int write, void *buffer, size_t *length, + loff_t *ppos) +{ + int ret, nid; + + ret =3D proc_dointvec_minmax(table, write, buffer, length, ppos); + if (ret || !write) + return ret; + + for_each_node_state(nid, N_MEMORY) + balance_node_cma(nid, NULL); + + return 0; +} +#endif + static const struct ctl_table page_alloc_sysctl_table[] =3D { { .procname =3D "min_free_kbytes", @@ -6723,7 +6741,7 @@ static const struct ctl_table page_alloc_sysctl_table= [] =3D { .data =3D &cma_first_limit, .maxlen =3D sizeof(cma_first_limit), .mode =3D 0644, - .proc_handler =3D proc_dointvec_minmax, + .proc_handler =3D cma_first_limit_sysctl_handler, .extra1 =3D SYSCTL_ZERO, .extra2 =3D SYSCTL_ONE_HUNDRED, }, --=20 2.51.0.384.g4c02a37b29-goog