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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 Cc: Russell King - ARM Linux admin , Arnd Bergmann , Linus Walleij , linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, Catalin Marinas , Will Deacon 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-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.9.3 (2018-01-21) X-Rspamd-Queue-Id: 25AA3186B9776 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam04 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: 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