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[47.72.206.164]) by smtp.gmail.com with ESMTPSA id a11-20020a1709027e4b00b0016a3b5a46f0sm27907831pln.241.2022.07.07.05.53.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 07 Jul 2022 05:53:17 -0700 (PDT) From: Barry Song <21cnbao@gmail.com> To: akpm@linux-foundation.org, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, x86@kernel.org, catalin.marinas@arm.com, will@kernel.org, linux-doc@vger.kernel.org Cc: corbet@lwn.net, arnd@arndb.de, linux-kernel@vger.kernel.org, darren@os.amperecomputing.com, yangyicong@hisilicon.com, huzhanyuan@oppo.com, lipeifeng@oppo.com, zhangshiming@oppo.com, guojian@oppo.com, realmz6@gmail.com, Barry Song , Nadav Amit , Mel Gorman Subject: [PATCH 2/4] mm: rmap: Allow platforms without mm_cpumask to defer TLB flush Date: Fri, 8 Jul 2022 00:52:40 +1200 Message-Id: <20220707125242.425242-3-21cnbao@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220707125242.425242-1-21cnbao@gmail.com> References: <20220707125242.425242-1-21cnbao@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM, RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Barry Song Platforms like ARM64 have hareware TLB shootdown broadcast. They don't maintain mm_cpumask and they just send tlbi and related sync instructions for TLB flush. So if mm_cpumask is empty, we also allow deferred TLB flush Cc: Nadav Amit Cc: Mel Gorman Signed-off-by: Barry Song > --- mm/rmap.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/mm/rmap.c b/mm/rmap.c index 5bcb334cd6f2..d320c29a4ad8 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -692,8 +692,13 @@ static bool should_defer_flush(struct mm_struct *mm, enum ttu_flags flags) if (!(flags & TTU_BATCH_FLUSH)) return false; - /* If remote CPUs need to be flushed then defer batch the flush */ - if (cpumask_any_but(mm_cpumask(mm), get_cpu()) < nr_cpu_ids) + /* + * If remote CPUs need to be flushed then defer batch the flush; + * If ARCHs like ARM64 have hardware TLB flush broadcast, thus + * they don't maintain mm_cpumask() at all, defer batch as well. + */ + if (cpumask_any_but(mm_cpumask(mm), get_cpu()) < nr_cpu_ids || + cpumask_empty(mm_cpumask(mm))) should_defer = true; put_cpu(); -- 2.25.1