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Fri, 12 Jun 2020 09:01:14 -0700 (PDT) Date: Fri, 12 Jun 2020 21:31:12 +0530 From: afzal mohammed To: Nicolas Pitre Subject: Re: [RFC 0/3] ARM: copy_{from,to}_user() for vmsplit 4g/4g Message-ID: <20200612160112.GA27659@afzalpc> References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.9.3 (2018-01-21) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200612_090116_655847_2AAF32F5 X-CRM114-Status: UNSURE ( 9.18 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Arnd Bergmann , Catalin Marinas , Linus Walleij , Russell King - ARM Linux admin , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Will Deacon , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi, On Fri, Jun 12, 2020 at 11:19:23AM -0400, Nicolas Pitre wrote: > On Fri, 12 Jun 2020, afzal mohammed wrote: > > Performance wise, results are not encouraging, 'dd' on tmpfs results, > Could you compare with CONFIG_UACCESS_WITH_MEMCPY as well? 512 1K 4K 16K 32K 64K 1M normal 30 46 89 95 90 85 65 uaccess_w_memcpy 28.5 45 85 92 91 85 65 w/ series 22 36 72 79 78 75 61 There are variations in the range +/-2 in some readings when repeated, not put above, to keep comparison simple. Regards afzal _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel