From mboxrd@z Thu Jan 1 00:00:00 1970 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 E54C7C433F5 for ; Mon, 7 Feb 2022 21:00:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231605AbiBGVAi (ORCPT ); Mon, 7 Feb 2022 16:00:38 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34968 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231806AbiBGVA0 (ORCPT ); Mon, 7 Feb 2022 16:00:26 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AE348C043180 for ; Mon, 7 Feb 2022 13:00:25 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 42B8361565 for ; Mon, 7 Feb 2022 21:00:25 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 96ECFC340EE; Mon, 7 Feb 2022 21:00:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1644267624; bh=1gcc7gMZC2CtSoOj5yPHSFsfiSSxGn2YlyqalcXIbpM=; h=Date:To:From:Subject:From; b=1B2LQqJQdED7uyiuSqCdJvmoKMt195laCbiU7B5uFEH1XX/zVCKbrr4c4I2lk3Rcs YMdrWkPoGjofP8hAk7bGgpCLbF/DLE+kwgc1Z2iudQ+9V+HFgd3oNEXv0mUZncnkHM EvUKx1+gjrrMdHd5qX99QOWQPnAHnIIriKnL0Y6k= Date: Mon, 07 Feb 2022 13:00:24 -0800 To: mm-commits@vger.kernel.org, david@redhat.com, linmiaohe@huawei.com, akpm@linux-foundation.org From: Andrew Morton Subject: + mm-memory_hotplug-avoid-calling-zone_intersects-for-zone_normal.patch added to -mm tree Message-Id: <20220207210024.96ECFC340EE@smtp.kernel.org> Precedence: bulk Reply-To: linux-kernel@vger.kernel.org List-ID: X-Mailing-List: mm-commits@vger.kernel.org The patch titled Subject: mm/memory_hotplug: avoid calling zone_intersects() for ZONE_NORMAL has been added to the -mm tree. Its filename is mm-memory_hotplug-avoid-calling-zone_intersects-for-zone_normal.patch This patch should soon appear at https://ozlabs.org/~akpm/mmots/broken-out/mm-memory_hotplug-avoid-calling-zone_intersects-for-zone_normal.patch and later at https://ozlabs.org/~akpm/mmotm/broken-out/mm-memory_hotplug-avoid-calling-zone_intersects-for-zone_normal.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next and is updated there every 3-4 working days ------------------------------------------------------ From: Miaohe Lin Subject: mm/memory_hotplug: avoid calling zone_intersects() for ZONE_NORMAL If zid reaches ZONE_NORMAL, the caller will always get the NORMAL zone no matter what zone_intersects() returns. So we can save some possible cpu cycles by avoid calling zone_intersects() for ZONE_NORMAL. Link: https://lkml.kernel.org/r/20220207133643.23427-3-linmiaohe@huawei.com Signed-off-by: Miaohe Lin Reviewed-by: David Hildenbrand Signed-off-by: Andrew Morton --- mm/memory_hotplug.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/mm/memory_hotplug.c~mm-memory_hotplug-avoid-calling-zone_intersects-for-zone_normal +++ a/mm/memory_hotplug.c @@ -823,7 +823,7 @@ static struct zone *default_kernel_zone_ struct pglist_data *pgdat = NODE_DATA(nid); int zid; - for (zid = 0; zid <= ZONE_NORMAL; zid++) { + for (zid = 0; zid < ZONE_NORMAL; zid++) { struct zone *zone = &pgdat->node_zones[zid]; if (zone_intersects(zone, start_pfn, nr_pages)) _ Patches currently in -mm which might be from linmiaohe@huawei.com are mm-memremap-avoid-calling-kasan_remove_zero_shadow-for-device-private-memory.patch mm-sparse-make-mminit_validate_memmodel_limits-static.patch mm-vmalloc-remove-unneeded-function-forward-declaration.patch mm-mmzoneh-remove-unused-macros.patch mm-balloon_compaction-make-balloon-page-compaction-callbacks-static.patch mm-memory_hotplug-remove-obsolete-comment-of-__add_pages.patch mm-memory_hotplug-avoid-calling-zone_intersects-for-zone_normal.patch mm-memory_hotplug-clean-up-try_offline_node.patch mm-memory_hotplug-fix-misplaced-comment-in-offline_pages.patch mm-highmem-remove-unnecessary-done-label.patch mm-hmmc-remove-unneeded-local-variable-ret.patch