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Thu, 28 Jul 2022 13:45:33 -0700 (PDT) From: Kairui Song To: linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org, Andrew Morton , Kairui Song Subject: [RFC PATCH 7/7] x86_64/tlb, mm: enable cpumask optimzation for RSS cache Date: Fri, 29 Jul 2022 04:45:11 +0800 Message-Id: <20220728204511.56348-8-ryncsn@gmail.com> X-Mailer: git-send-email 2.35.2 In-Reply-To: <20220728204511.56348-1-ryncsn@gmail.com> References: <20220728204511.56348-1-ryncsn@gmail.com> Reply-To: Kairui Song MIME-Version: 1.0 Content-Transfer-Encoding: 8bit ARC-Authentication-Results: i=1; imf24.hostedemail.com; dkim=pass header.d=gmail.com header.s=20210112 header.b=CqUpKZVc; spf=pass (imf24.hostedemail.com: domain of ryncsn@gmail.com designates 209.85.216.41 as permitted sender) smtp.mailfrom=ryncsn@gmail.com; dmarc=pass (policy=none) header.from=gmail.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1659041135; a=rsa-sha256; cv=none; b=f+HeOrk2ZmfNV7O2o99MYhMH3grHnkQ8Jelb7HphZEsn0rgOV/jUxddb/9Y1qIue+NEuF2 7ugd4zo9ihgB4ZyEyiT/Y7XrbeHLB2DoK99hv+0x4o2ZpaHCC/DY9HSH4vKGTCI5/5qyuE XN2GHZ0yG7dnJKX+SxwjmuVKq/yeXws= ARC-Message-Signature: i=1; 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On x86_64 this is the unified routine for switching a mm, so hook into this can make sure any dead mm will have their cache invalidated in time, and cpumask is synced with cache state. Signed-off-by: Kairui Song --- arch/x86/Kconfig | 1 + arch/x86/mm/tlb.c | 5 +++++ 2 files changed, 6 insertions(+) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 52a7f91527fe..15e2b29ba972 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -125,6 +125,7 @@ config X86 select ARCH_WANT_LD_ORPHAN_WARN select ARCH_WANTS_THP_SWAP if X86_64 select ARCH_HAS_PARANOID_L1D_FLUSH + select ARCH_PCP_RSS_USE_CPUMASK if X86_64 select BUILDTIME_TABLE_SORT select CLKEVT_I8253 select CLOCKSOURCE_VALIDATE_LAST_CYCLE diff --git a/arch/x86/mm/tlb.c b/arch/x86/mm/tlb.c index d400b6d9d246..614865f94d85 100644 --- a/arch/x86/mm/tlb.c +++ b/arch/x86/mm/tlb.c @@ -597,6 +597,11 @@ void switch_mm_irqs_off(struct mm_struct *prev, struct mm_struct *next, */ cond_mitigation(tsk); + /* + * Flush RSS cache before clear up the bitmask + */ + switch_pcp_rss_cache_no_irq(next); + /* * Stop remote flushes for the previous mm. * Skip kernel threads; we never send init_mm TLB flushing IPIs, -- 2.35.2