From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f201.google.com (mail-pl1-f201.google.com [209.85.214.201]) (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 7E8B61F1311 for ; Mon, 4 Aug 2025 18:31:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754332285; cv=none; b=FLMn9KOQKg2uU28U6aCu9ZuqheSRgPDDuTD+qxufwlLgyWoSSZInC/4HrVqWW9gOIvBD+ImM9ZVlNLZo4xPyaojKI5xr9tDK+9uiozBgYIlKiP79e1MC218SZa4Yg8BuuaXDtjZLrh3YVNbwzgnZTNLEomm2EG0/HHUMKLKb6Pc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754332285; c=relaxed/simple; bh=2ZVlhV6ndThCFd4+zGJNIWInZ4a60Ev1vYWmuIdzmJ4=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=Ikmz0HzVOfoLqNW8+DYvygc6TTcyT4Nt3RVN6skv8oNgYxia9A9UuCX8dvrMH9/OkxEs/729jVcSt3PTJ08v+RnIyobYViFnGTlKb9Ljn232WlggI+4WBB0o40BpRDJPoZLZTQh1im6lrjTq8GgZxmrwJ+7S+siw7JL4aytw1Hk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--jyescas.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=19E5wnH1; arc=none smtp.client-ip=209.85.214.201 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--jyescas.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="19E5wnH1" Received: by mail-pl1-f201.google.com with SMTP id d9443c01a7336-237e6963f70so92499645ad.2 for ; Mon, 04 Aug 2025 11:31:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1754332284; x=1754937084; 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=2ZVlhV6ndThCFd4+zGJNIWInZ4a60Ev1vYWmuIdzmJ4=; b=19E5wnH1xcWWnluOpw2kqQ5rHIaUPP11QZII2es13gK63dNEbQfPs7cbs9shqgmbIY HYKM3jhFZkbMTsEphYjdoBGcpm8pQrJX0tbkV4/ImrphGETzqXlNOFHL1hVE82FYPv5L n0xzUyhHUHVqB5V42dYZRBXfikrx4UxS/QeW1hRHP6AyD2rcGIeV+qefSq4Q3RF5h/vz kO+muXerE+vYSTo6ddN6v7yXWTlmcJzsMeV96VKcR1bFSMbHK7xEfT8t3E2WIFyNdIV2 sDf77HhL7/uJE8zRC8Te0hAe42A+YTQTwkmKSLQ+4eQeizb35mTIhl9MfuG8vyAqCCud dnbw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1754332284; x=1754937084; 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=2ZVlhV6ndThCFd4+zGJNIWInZ4a60Ev1vYWmuIdzmJ4=; b=HC7qO0NcqnRtdELsnMZIi7+s+mklCLmgaw4z39/OlMs38tkZZMYZVvn9tGOgop1j21 Y/67KHMjoAuMx0yAVyctHmbtQhTTUiXcwO4rhQ0irnCk/+MBz2krWb0BApmWxR2ho24f e4emnSkrrA5RdrTRsCv/Djizty6xZobfb9B3lboNLJ0q5YIZHvglx1oHo82DF5a3gNal xzuuuBjXjH0C6UwsAuBTSI9ldXNR2FqzlL87upz0hSBKxo1+JGDsB0zTPJxnPJejtfA8 BBPVcosBWZ7OzhmOZZrYZi6t7qPxvF6bfLkxNYibeOuIq837vYOvuCz3AZLNLGa+a3nn COsA== X-Forwarded-Encrypted: i=1; AJvYcCU067Yg6SHy4vIVdrQcneZi/yej3Xc2LsYZ93yLJIX5z6MxZwyaj8Cx2i2pxmCKUk3644Yo1yzl26DeyJ4=@vger.kernel.org X-Gm-Message-State: AOJu0YwRS+4D5B6b/pSWZLQt14adnWymS/PKrKYYyoYat+PZ4PbHk3dY hgpUKhL3Tq9surA358kS9T5KlVQF0KI6n4LIXam9s9Zt3oOBDmTb0Y5H3N07Bd2yf3vMMvGU+Tk R8GY3NEXq1Q== X-Google-Smtp-Source: AGHT+IHWBu3VQz8pzZ+1rcfbz3HxJNSMQP0rdBf6OTWgijBCozRjoOUWrc/UH4pOKHcnDrH55Kq6u4Oao4QE X-Received: from plgw17.prod.google.com ([2002:a17:902:e891:b0:23f:fded:852b]) (user=jyescas job=prod-delivery.src-stubby-dispatcher) by 2002:a17:902:d506:b0:240:52c8:2556 with SMTP id d9443c01a7336-24247023afamr130598435ad.39.1754332283728; Mon, 04 Aug 2025 11:31:23 -0700 (PDT) Date: Mon, 4 Aug 2025 11:31:21 -0700 In-Reply-To: <67a54f31-e568-427a-8fc8-9791fd34e11b@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <67a54f31-e568-427a-8fc8-9791fd34e11b@redhat.com> X-Mailer: git-send-email 2.50.1.565.gc32cd1483b-goog Message-ID: <20250804183121.2892827-1-jyescas@google.com> Subject: [RFC PATCH] mm/page_alloc: Add PCP list for THP CMA From: Juan Yescas To: david@redhat.com Cc: akash.tyagi@mediatek.com, akpm@linux-foundation.org, angelogioacchino.delregno@collabora.com, hannes@cmpxchg.org, jackmanb@google.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mediatek@lists.infradead.org, linux-mm@kvack.org, matthias.bgg@gmail.com, mhocko@suse.com, surenb@google.com, jyescas@google.com, kaleshsingh@google.com, tjmercier@google.com, isaacmanjarres@google.com, vbabka@suse.cz, wsd_upstream@mediatek.com, ziy@nvidia.com Content-Type: text/plain; charset="UTF-8" Hi David/Zi, Is there any reason why the MIGRATE_CMA pages are not in the PCP lists? There are many devices that need fast allocation of MIGRATE_CMA pages, and they have to get them from the buddy allocator, which is a bit slower in comparison to the PCP lists. We also have cases where the MIGRATE_CMA memory requirements are big. For example, GPUs need MIGRATE_CMA memory in the ranges of 30MiB to 500MiBs. These cases would benefit if we have THPs for CMAs. Could we add the support for MIGRATE_CMA pages on the PCP and THP lists? Thanks