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h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=WbDgetigVfP4aw5GQwkC4/+qzJgMfkCRZ/CwVfM+DoWhVsV2cSyKM+d0KjSYmohjG D9MNWSGnvMyDqphojTexHK6yncBn+D75NAjadehGe185l4ywdlwBA4CRdqXEgUAQpQ LFHfUu8b17Q+Go/GjBQs5pUYIY0N53InUiC/aUt8= Date: Wed, 3 Apr 2024 13:45:39 -0700 From: Andrew Morton To: Kefeng Wang Cc: Russell King , Catalin Marinas , Will Deacon , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexander Gordeev , Gerald Schaefer , Dave Hansen , Andy Lutomirski , Peter Zijlstra , , , , , , , Subject: Re: [PATCH v2 0/7] arch/mm/fault: accelerate pagefault when badaccess Message-Id: <20240403134539.fde3a6c594f2d88409be30ed@linux-foundation.org> In-Reply-To: <20240403083805.1818160-1-wangkefeng.wang@huawei.com> References: <20240403083805.1818160-1-wangkefeng.wang@huawei.com> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 1D4A418000E X-Stat-Signature: 5m5dy7nrrbxoca9onhocmuz1ti5sio6a X-Rspam-User: X-HE-Tag: 1712177141-91031 X-HE-Meta: U2FsdGVkX18g+3WEftIcM8lkx8/4JygWzWuNv+ccedsSyeBHoH02aaWNMpd115K6K04nzUWr6OAJUjI1AQA4f+JKbZemH9TAV13QWqu+kBUI88JbDpLzjfbiHZuOHhonqSMpB1FE8FmDA4yEwgnCHdra9p0ye1LVDu7IzVpTj2afd9+KsKmi75hTT66z4HoMAEzDmDRtXKYtlY8m5KTeRBFpepESsx2v8BBtz9FShFT6oZZ/rxpNNuuqHNcgGSxxNUmfhWUgN86TR1d579ek6Y5qYaIqayIFQNVeN83T0QqZhDz4gEyNp/vI7PvRJQEcDsEqeUWPaIzqakbracHB7crnbH+RW+vCuYmCXjnQrX82ZvU03JiwAAT29wH2DOZmggZEqpdRoJNxhVnoaYlymRDEGiJiyAVoi0A40fA6ZbiiTkqR499P7x0HPps8mBIFBva70n1hxhnSo8t3I6Cqo7gXSmBLL7hZ3vI6ymy4rtVxN7d08jsk24XZhKHRGEy5xQKAfWMh+rOKBjSRlJrM5euQ+wIXbv7pRlp93oFRV12ZQu3+B+ybQm9fUjv9ULNSnu/e/rBbwzXU3HHpO9xgV489cUjXn52ByFLOhzMoJuKWoEXBHuMuP8OBPmW2ZSiEo6tzr+jvYSVlV0V+Ks3E2ulL0JA1LzOJFKpcnrFveQKlsVmG497P+uAYlTmQgEvSm1tccoWBEckAn1BHOIytw5Kzvq9YF7KqXzSa6Qv8FFqwxAMSIlfhOsVsPU/Vwem+q658HlgN4ryht6K5TZAR3tHRzjeQ5CKm4hk4pPRLqUa7wbzU9e8cYklpmJ7Z0ojDFY805+rkk6Osd/VdZYyOx2eHPhIZid8fuUE9ENbUlUIteDC8GKtDi9S9bdxXfig7H0iJnGY3GNDdg5BabI17I26ORMZeXabbNmn474+EYE/Vls539SrYyQcZawb8X+CO3DN0viWs0XZ+sfiwGyl PtW3Z+QM 5xH+AVDOcO2BO2xzbPi7yC9s2S3kIcO9PHXYfnVl4sxXgT8WW08Pet+U9a64w6cNs+br4GanKa+Pbig0QzolygpH27QGNi2jcFoyqaauXKwEuFL60JziCWmGF2rYMrzclv1YiL1i3ywPPBuxjqfO2etiuXXun2GM0I03+dp1tcDX5P0PgSbqygQBC81HWqZspAcA6LB90+N5/ixgl6DqxXrqIusjI3G62C5xOfy7GuEQE+LFZ9E1xV3Lj4RudLJyJDTiS4l8UPLWa3Rk7aZy2j/xK6w== 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: List-Subscribe: List-Unsubscribe: On Wed, 3 Apr 2024 16:37:58 +0800 Kefeng Wang wrote: > After VMA lock-based page fault handling enabled, if bad access met > under per-vma lock, it will fallback to mmap_lock-based handling, > so it leads to unnessary mmap lock and vma find again. A test from > lmbench shows 34% improve after this changes on arm64, > > lat_sig -P 1 prot lat_sig 0.29194 -> 0.19198 > > Only build test on other archs except arm64. Thanks. So we now want a bunch of architectures to runtime test this. Do we have a selftest in place which will adequately do this?