From nobody Fri Sep 12 00:58:13 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A9A67C04A94 for ; Wed, 9 Aug 2023 02:07:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230110AbjHICHv (ORCPT ); Tue, 8 Aug 2023 22:07:51 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53600 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229840AbjHICHs (ORCPT ); Tue, 8 Aug 2023 22:07:48 -0400 Received: from dggsgout11.his.huawei.com (dggsgout11.his.huawei.com [45.249.212.51]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 77E6D1BCD for ; Tue, 8 Aug 2023 19:07:48 -0700 (PDT) Received: from mail02.huawei.com (unknown [172.30.67.143]) by dggsgout11.his.huawei.com (SkyGuard) with ESMTP id 4RLD3N5qqKz4f3pHf for ; Wed, 9 Aug 2023 10:07:44 +0800 (CST) Received: from huaweicloud.com (unknown [10.175.124.27]) by APP2 (Coremail) with SMTP id Syh0CgBXem7v9NJkFAkTAQ--.60414S3; Wed, 09 Aug 2023 10:07:45 +0800 (CST) From: Kemeng Shi To: linux-mm@kvack.org, linux-kernel@vger.kernel.org, akpm@linux-foundation.org, baolin.wang@linux.alibaba.com, mgorman@techsingularity.net, david@redhat.com, willy@infradead.org Cc: shikemeng@huaweicloud.com Subject: [PATCH 1/2] mm/page_alloc: remove track of active PCP lists range in bulk free Date: Wed, 9 Aug 2023 18:07:53 +0800 Message-Id: <20230809100754.3094517-2-shikemeng@huaweicloud.com> X-Mailer: git-send-email 2.30.0 In-Reply-To: <20230809100754.3094517-1-shikemeng@huaweicloud.com> References: <20230809100754.3094517-1-shikemeng@huaweicloud.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: Syh0CgBXem7v9NJkFAkTAQ--.60414S3 X-Coremail-Antispam: 1UD129KBjvJXoW7KFyrKFWkGw4kKFyrKr18AFb_yoW8GFy7pF Wftw1SyrWkJryrCr4DAa1Dury7Kw1qkFWDurWrG348ZwnxWFyIk3WIqr9ayFyrJFWkZFy7 AF4UJryFya4UZ3JanT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUBK14x267AKxVW5JVWrJwAFc2x0x2IEx4CE42xK8VAvwI8IcIk0 rVWrJVCq3wAFIxvE14AKwVWUJVWUGwA2jI8I6cxK62vIxIIY0VWUZVW8XwA2048vs2IY02 0E87I2jVAFwI0_Jr4l82xGYIkIc2x26xkF7I0E14v26r1I6r4UM28lY4IEw2IIxxk0rwA2 F7IY1VAKz4vEj48ve4kI8wA2z4x0Y4vE2Ix0cI8IcVAFwI0_tr0E3s1l84ACjcxK6xIIjx v20xvEc7CjxVAFwI0_Cr1j6rxdM28EF7xvwVC2z280aVAFwI0_GcCE3s1l84ACjcxK6I8E 87Iv6xkF7I0E14v26rxl6s0DM2AIxVAIcxkEcVAq07x20xvEncxIr21l5I8CrVACY4xI64 kE6c02F40Ex7xfMcIj6xIIjxv20xvE14v26r1j6r18McIj6I8E87Iv67AKxVWUJVW8JwAm 72CE4IkC6x0Yz7v_Jr0_Gr1lF7xvr2IYc2Ij64vIr41lF7I21c0EjII2zVCS5cI20VAGYx C7MxAIw28IcxkI7VAKI48JMxC20s026xCaFVCjc4AY6r1j6r4UMI8I3I0E5I8CrVAFwI0_ Jr0_Jr4lx2IqxVCjr7xvwVAFwI0_JrI_JrWlx4CE17CEb7AF67AKxVWUtVW8ZwCIc40Y0x 0EwIxGrwCI42IY6xIIjxv20xvE14v26r1j6r1xMIIF0xvE2Ix0cI8IcVCY1x0267AKxVW8 JVWxJwCI42IY6xAIw20EY4v20xvaj40_Jr0_JF4lIxAIcVC2z280aVAFwI0_Jr0_Gr1lIx AIcVC2z280aVCY1x0267AKxVW8JVW8JrUvcSsGvfC2KfnxnUUI43ZEXa7sRE2NtUUUUUU= = X-CM-SenderInfo: 5vklyvpphqwq5kxd4v5lfo033gof0z/ X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" After commit fd56eef258a17 ("mm/page_alloc: simplify how many pages are selected per pcp list during bulk free"), we will drain all pages in selected pcp list. And we ensured passed count is < pcp->count. Then, the search will finish before wrap-around and track of active PCP lists range intended for wrap-around case is no longer needed. Signed-off-by: Kemeng Shi --- mm/page_alloc.c | 15 +++------------ 1 file changed, 3 insertions(+), 12 deletions(-) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 96b7c1a7d1f2..1ddcb2707d05 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -1207,8 +1207,6 @@ static void free_pcppages_bulk(struct zone *zone, int= count, int pindex) { unsigned long flags; - int min_pindex =3D 0; - int max_pindex =3D NR_PCP_LISTS - 1; unsigned int order; bool isolated_pageblocks; struct page *page; @@ -1231,17 +1229,10 @@ static void free_pcppages_bulk(struct zone *zone, i= nt count, =20 /* Remove pages from lists in a round-robin fashion. */ do { - if (++pindex > max_pindex) - pindex =3D min_pindex; + if (++pindex > NR_PCP_LISTS - 1) + pindex =3D 0; list =3D &pcp->lists[pindex]; - if (!list_empty(list)) - break; - - if (pindex =3D=3D max_pindex) - max_pindex--; - if (pindex =3D=3D min_pindex) - min_pindex++; - } while (1); + } while (list_empty(list)); =20 order =3D pindex_to_order(pindex); nr_pages =3D 1 << order; --=20 2.30.0 From nobody Fri Sep 12 00:58:13 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 25700C001DB for ; Wed, 9 Aug 2023 02:07:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230204AbjHICHx (ORCPT ); Tue, 8 Aug 2023 22:07:53 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53616 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229881AbjHICHt (ORCPT ); Tue, 8 Aug 2023 22:07:49 -0400 Received: from dggsgout11.his.huawei.com (dggsgout11.his.huawei.com [45.249.212.51]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E481C1BCE for ; Tue, 8 Aug 2023 19:07:48 -0700 (PDT) Received: from mail02.huawei.com (unknown [172.30.67.143]) by dggsgout11.his.huawei.com (SkyGuard) with ESMTP id 4RLD3P62PCz4f3q2n for ; Wed, 9 Aug 2023 10:07:45 +0800 (CST) Received: from huaweicloud.com (unknown [10.175.124.27]) by APP2 (Coremail) with SMTP id Syh0CgBXem7v9NJkFAkTAQ--.60414S4; Wed, 09 Aug 2023 10:07:46 +0800 (CST) From: Kemeng Shi To: linux-mm@kvack.org, linux-kernel@vger.kernel.org, akpm@linux-foundation.org, baolin.wang@linux.alibaba.com, mgorman@techsingularity.net, david@redhat.com, willy@infradead.org Cc: shikemeng@huaweicloud.com Subject: [PATCH 2/2] mm/page_alloc: remove unnecessary parameter batch of nr_pcp_free Date: Wed, 9 Aug 2023 18:07:54 +0800 Message-Id: <20230809100754.3094517-3-shikemeng@huaweicloud.com> X-Mailer: git-send-email 2.30.0 In-Reply-To: <20230809100754.3094517-1-shikemeng@huaweicloud.com> References: <20230809100754.3094517-1-shikemeng@huaweicloud.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: Syh0CgBXem7v9NJkFAkTAQ--.60414S4 X-Coremail-Antispam: 1UD129KBjvJXoW7ZFyDGF47KFykZrW8Jw13Jwb_yoW8JFW8pF 93Kwn7KFWkWwn8G39rJF4qk34jka1rKFZ3K3yfW345XF13CryIkFyIyryDWF18KrykCFs7 CrZ5t34rZa1UXaUanT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUPab4IE77IF4wAFF20E14v26rWj6s0DM7CY07I20VC2zVCF04k2 6cxKx2IYs7xG6rWj6s0DM7CIcVAFz4kK6r1j6r18M280x2IEY4vEnII2IxkI6r1a6r45M2 8IrcIa0xkI8VA2jI8067AKxVWUXwA2048vs2IY020Ec7CjxVAFwI0_Gr0_Xr1l8cAvFVAK 0II2c7xJM28CjxkF64kEwVA0rcxSw2x7M28EF7xvwVC0I7IYx2IY67AKxVWDJVCq3wA2z4 x0Y4vE2Ix0cI8IcVCY1x0267AKxVWxJr0_GcWl84ACjcxK6I8E87Iv67AKxVW0oVCq3wA2 z4x0Y4vEx4A2jsIEc7CjxVAFwI0_GcCE3s1le2I262IYc4CY6c8Ij28IcVAaY2xG8wAqx4 xG64xvF2IEw4CE5I8CrVC2j2WlYx0E2Ix0cI8IcVAFwI0_Jr0_Jr4lYx0Ex4A2jsIE14v2 6r1j6r4UMcvjeVCFs4IE7xkEbVWUJVW8JwACjcxG0xvY0x0EwIxGrwACjI8F5VA0II8E6I AqYI8I648v4I1l42xK82IYc2Ij64vIr41l4I8I3I0E4IkC6x0Yz7v_Jr0_Gr1lx2IqxVAq x4xG67AKxVWUJVWUGwC20s026x8GjcxK67AKxVWUGVWUWwC2zVAF1VAY17CE14v26r1q6r 43MIIYrxkI7VAKI48JMIIF0xvE2Ix0cI8IcVAFwI0_Jr0_JF4lIxAIcVC0I7IYx2IY6xkF 7I0E14v26r4j6F4UMIIF0xvE42xK8VAvwI8IcIk0rVWUJVWUCwCI42IY6I8E87Iv67AKxV WUJVW8JwCI42IY6I8E87Iv6xkF7I0E14v26r4j6r4UJbIYCTnIWIevJa73UjIFyTuYvjTR QNVDUUUUU X-CM-SenderInfo: 5vklyvpphqwq5kxd4v5lfo033gof0z/ X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" We get batch from pcp and just pass it to nr_pcp_free immediately. Get batch from pcp inside nr_pcp_free to remove unnecessary parameter batch. Signed-off-by: Kemeng Shi --- mm/page_alloc.c | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 1ddcb2707d05..bb1d14e806ad 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -2376,10 +2376,10 @@ static bool free_unref_page_prepare(struct page *pa= ge, unsigned long pfn, return true; } =20 -static int nr_pcp_free(struct per_cpu_pages *pcp, int high, int batch, - bool free_high) +static int nr_pcp_free(struct per_cpu_pages *pcp, int high, bool free_high) { int min_nr_free, max_nr_free; + int batch =3D READ_ONCE(pcp->batch); =20 /* Free everything if batch freeing high-order pages. */ if (unlikely(free_high)) @@ -2446,9 +2446,7 @@ static void free_unref_page_commit(struct zone *zone,= struct per_cpu_pages *pcp, =20 high =3D nr_pcp_high(pcp, zone, free_high); if (pcp->count >=3D high) { - int batch =3D READ_ONCE(pcp->batch); - - free_pcppages_bulk(zone, nr_pcp_free(pcp, high, batch, free_high), pcp, = pindex); + free_pcppages_bulk(zone, nr_pcp_free(pcp, high, free_high), pcp, pindex); } } =20 --=20 2.30.0