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 8B10EC64EC4 for ; Fri, 3 Mar 2023 22:38:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233669AbjCCWiF (ORCPT ); Fri, 3 Mar 2023 17:38:05 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45022 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230512AbjCCWhp (ORCPT ); Fri, 3 Mar 2023 17:37:45 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D29B73A81 for ; Fri, 3 Mar 2023 14:35:57 -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 8538761944 for ; Fri, 3 Mar 2023 22:32:36 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id DDC8BC433D2; Fri, 3 Mar 2023 22:32:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1677882756; bh=Vdv2wbqTbvXy91RMYrJlS1lVWCGA9PSrQiy2gJTdKDs=; h=Date:To:From:Subject:From; b=RVKY31ajD/MRc6gijhUVgc5M0DdSajXHAHEXiYVmJsGFBRy7bEtHp52nY1JTB0etR Te4We0xTu3N3+Szb10vTPA/o1UcrBiDZ6773cMqjGE59Cf/UqxEEAzP6FDm6I3U+nr FsR8gu7WxgH4vtrhj2CsA66pPYvwJMptoo3SVIi8= Date: Fri, 03 Mar 2023 14:32:35 -0800 To: mm-commits@vger.kernel.org, tglx@linutronix.de, peterx@redhat.com, mingo@elte.hu, linux@armlinux.org.uk, hpa@zytor.com, hca@linux.ibm.com, frederic@kernel.org, david@redhat.com, cl@linux.com, chenhuacai@kernel.org, atomlin@atomlin.com, mtosatti@redhat.com, akpm@linux-foundation.org From: Andrew Morton Subject: + convert-this_cpu_cmpxchg-users-to-this_cpu_cmpxchg_local.patch added to mm-unstable branch Message-Id: <20230303223235.DDC8BC433D2@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: convert this_cpu_cmpxchg users to this_cpu_cmpxchg_local has been added to the -mm mm-unstable branch. Its filename is convert-this_cpu_cmpxchg-users-to-this_cpu_cmpxchg_local.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/convert-this_cpu_cmpxchg-users-to-this_cpu_cmpxchg_local.patch This patch will later appear in the mm-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm 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 via the mm-everything branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there every 2-3 working days ------------------------------------------------------ From: Marcelo Tosatti Subject: convert this_cpu_cmpxchg users to this_cpu_cmpxchg_local Date: Fri, 03 Mar 2023 16:58:48 -0300 this_cpu_cmpxchg was modified to atomic version, which can be more costly than non-atomic version. Switch users of this_cpu_cmpxchg to this_cpu_cmpxchg_local (which preserves pre-non-atomic this_cpu_cmpxchg behaviour). Link: https://lkml.kernel.org/r/20230303195908.926950608@redhat.com Acked-by: Peter Xu Signed-off-by: Marcelo Tosatti Cc: Aaron Tomlin Cc: Christoph Lameter Cc: David Hildenbrand Cc: Frederic Weisbecker Cc: Heiko Carstens Cc: "H. Peter Anvin" Cc: Huacai Chen Cc: Ingo Molnar Cc: "Russell King (Oracle)" Cc: Thomas Gleixner Signed-off-by: Andrew Morton --- --- a/kernel/fork.c~convert-this_cpu_cmpxchg-users-to-this_cpu_cmpxchg_local +++ a/kernel/fork.c @@ -203,7 +203,7 @@ static bool try_release_thread_stack_to_ unsigned int i; for (i = 0; i < NR_CACHED_STACKS; i++) { - if (this_cpu_cmpxchg(cached_stacks[i], NULL, vm) != NULL) + if (this_cpu_cmpxchg_local(cached_stacks[i], NULL, vm) != NULL) continue; return true; } --- a/kernel/scs.c~convert-this_cpu_cmpxchg-users-to-this_cpu_cmpxchg_local +++ a/kernel/scs.c @@ -83,7 +83,7 @@ void scs_free(void *s) */ for (i = 0; i < NR_CACHED_SCS; i++) - if (this_cpu_cmpxchg(scs_cache[i], 0, s) == NULL) + if (this_cpu_cmpxchg_local(scs_cache[i], 0, s) == NULL) return; kasan_unpoison_vmalloc(s, SCS_SIZE, KASAN_VMALLOC_PROT_NORMAL); _ Patches currently in -mm which might be from mtosatti@redhat.com are mm-vmstat-remove-remote-node-draining.patch this_cpu_cmpxchg-arm64-switch-this_cpu_cmpxchg-to-locked-add-_local-function.patch this_cpu_cmpxchg-loongarch-switch-this_cpu_cmpxchg-to-locked-add-_local-function.patch this_cpu_cmpxchg-s390-switch-this_cpu_cmpxchg-to-locked-add-_local-function.patch this_cpu_cmpxchg-x86-switch-this_cpu_cmpxchg-to-locked-add-_local-function.patch add-this_cpu_cmpxchg_local-and-asm-generic-definitions.patch convert-this_cpu_cmpxchg-users-to-this_cpu_cmpxchg_local.patch mm-vmstat-switch-counter-modification-to-cmpxchg.patch mm-vmstat-use-xchg-in-cpu_vm_stats_fold.patch mm-vmstat-switch-vmstat-shepherd-to-flush-per-cpu-counters-remotely.patch mm-vmstat-refresh-stats-remotely-instead-of-via-work-item.patch