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[90.235.18.147]) by smtp.gmail.com with ESMTPSA id t1-20020ac24c01000000b004f37b88eacfsm1111065lfq.187.2023.05.16.06.42.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 16 May 2023 06:42:23 -0700 (PDT) From: Uladzislau Rezki X-Google-Original-From: Uladzislau Rezki Date: Tue, 16 May 2023 15:42:20 +0200 To: Thomas Gleixner Cc: "Russell King (Oracle)" , Andrew Morton , linux-mm@kvack.org, Christoph Hellwig , Uladzislau Rezki , Lorenzo Stoakes , Peter Zijlstra , Baoquan He , John Ogness , linux-arm-kernel@lists.infradead.org, Mark Rutland , Marc Zyngier , x86@kernel.org Subject: Re: Excessive TLB flush ranges Message-ID: References: <87a5y5a6kj.ffs@tglx> <87353x9y3l.ffs@tglx> <87zg658fla.ffs@tglx> <87r0rg93z5.ffs@tglx> <87cz308y3s.ffs@tglx> <87y1lo7a0z.ffs@tglx> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <87y1lo7a0z.ffs@tglx> X-Stat-Signature: ewk4xs1xr5o4ywc5d5zazrb8dtj19z5d X-Rspam-User: X-Rspamd-Queue-Id: 3D36540010 X-Rspamd-Server: rspam07 X-HE-Tag: 1684244545-611173 X-HE-Meta: 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 /FEuPvb3 w9VHYWoSZ/tg1sTAqJw17F4Z14+p1CPq9gTT+6bm/wKn/E8JWFoiHewd1J3ALOZ9L3v6IgtjuOTNpXfgmaCZbmTKMfEkYEjhi0jrdwsNHuR0ysCKkdNibpiY6ZJGC5zcYq2K9rrbKQAF5kTkQ6/MhCxWkl569Hi2vlOY3eRHakOII1c7g/8indhRDTGUdcTQuuBr6GX8x6qOTq40g2jLzgctzooKzUO7/CPSPhsGachZ8o6/riC2ZpywtrNNc4nGN4hOxHXQ8QynfwMz4AN2Y0TDADgz3yHWITafr2RTgk5FE8Qrxg9SJeTn4knTG8KoEJfXKMDJJRHptTmKrqmSmRqzNy5QCbs5IAFYTzFBtGK7dL4vHDY3kEF5ky+cZLW1P1QT8T8pvDQKBXJkwicIh5Ec6/muxLsBrhdDB1wWRRC8iqTk= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: > _vm_unmap_aliases() collects dirty ranges from per cpu vmap_block_queue > (what ever that is) and hands a start..end range to > __purge_vmap_area_lazy(). > > As I pointed out already, this can also end up being an excessive range > because there is no guarantee that those individual collected ranges are > consecutive. Though I have no idea how to cure that right now. > > AFAICT this was done to spare flush IPIs, but the mm folks should be > able to explain that properly. > This is done to prevent generating IPIs. That is why the whole range is calculated once and a flush occurs only once for all lazily registered VAs. -- Uladzislau Rezki