From: afzal mohammed <afzal.mohd.ma@gmail.com>
To: Nicolas Pitre <nico@fluxnic.net>
Cc: Arnd Bergmann <arnd@arndb.de>,
Catalin Marinas <catalin.marinas@arm.com>,
Linus Walleij <linus.walleij@linaro.org>,
Russell King - ARM Linux admin <linux@armlinux.org.uk>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Will Deacon <will@kernel.org>,
linux-arm-kernel@lists.infradead.org
Subject: Re: [RFC 0/3] ARM: copy_{from,to}_user() for vmsplit 4g/4g
Date: Fri, 12 Jun 2020 21:31:12 +0530 [thread overview]
Message-ID: <20200612160112.GA27659@afzalpc> (raw)
In-Reply-To: <nycvar.YSQ.7.77.849.2006121117250.3341460@knanqh.ubzr>
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
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linux-arm-kernel@lists.infradead.org
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WARNING: multiple messages have this Message-ID (diff)
From: afzal mohammed <afzal.mohd.ma@gmail.com>
To: Nicolas Pitre <nico@fluxnic.net>
Cc: Russell King - ARM Linux admin <linux@armlinux.org.uk>,
Arnd Bergmann <arnd@arndb.de>,
Linus Walleij <linus.walleij@linaro.org>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
linux-arm-kernel@lists.infradead.org,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>
Subject: Re: [RFC 0/3] ARM: copy_{from,to}_user() for vmsplit 4g/4g
Date: Fri, 12 Jun 2020 21:31:12 +0530 [thread overview]
Message-ID: <20200612160112.GA27659@afzalpc> (raw)
In-Reply-To: <nycvar.YSQ.7.77.849.2006121117250.3341460@knanqh.ubzr>
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
next prev parent reply other threads:[~2020-06-12 16:01 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-12 10:17 [RFC 0/3] ARM: copy_{from,to}_user() for vmsplit 4g/4g afzal mohammed
2020-06-12 10:17 ` afzal mohammed
2020-06-12 10:17 ` [RFC 1/3] lib: copy_{from,to}_user using gup & kmap_atomic() afzal mohammed
2020-06-12 10:35 ` [RFC PATCH " afzal mohammed
2020-06-12 12:02 ` [RFC " Arnd Bergmann
2020-06-12 12:02 ` Arnd Bergmann
2020-06-12 13:55 ` afzal mohammed
2020-06-12 13:55 ` afzal mohammed
2020-06-12 20:07 ` Arnd Bergmann
2020-06-12 20:07 ` Arnd Bergmann
2020-06-13 12:04 ` afzal mohammed
2020-06-13 12:04 ` afzal mohammed
2020-06-13 12:51 ` Al Viro
2020-06-13 12:51 ` Al Viro
2020-06-13 12:56 ` Al Viro
2020-06-13 12:56 ` Al Viro
2020-06-13 13:42 ` afzal mohammed
2020-06-13 13:42 ` afzal mohammed
2020-06-13 15:31 ` Al Viro
2020-06-13 15:31 ` Al Viro
2020-06-13 15:41 ` Al Viro
2020-06-13 15:41 ` Al Viro
2020-06-13 16:00 ` Al Viro
2020-06-13 16:00 ` Al Viro
2020-06-13 18:55 ` Arnd Bergmann
2020-06-13 18:55 ` Arnd Bergmann
2020-06-15 11:22 ` David Laight
2020-06-15 11:22 ` David Laight
2020-06-13 13:15 ` Russell King - ARM Linux admin
2020-06-13 13:15 ` Russell King - ARM Linux admin
2020-06-14 13:06 ` afzal mohammed
2020-06-14 13:06 ` afzal mohammed
2020-06-13 20:45 ` Arnd Bergmann
2020-06-13 20:45 ` Arnd Bergmann
2020-06-13 22:16 ` Matthew Wilcox
2020-06-13 22:16 ` Matthew Wilcox
2020-06-14 13:21 ` afzal mohammed
2020-06-14 13:21 ` afzal mohammed
2020-06-14 14:55 ` afzal mohammed
2020-06-14 14:55 ` afzal mohammed
2020-06-13 11:08 ` Andy Shevchenko
2020-06-13 11:08 ` Andy Shevchenko
2020-06-13 13:29 ` afzal mohammed
2020-06-13 13:29 ` afzal mohammed
2020-06-12 10:18 ` [RFC 2/3] ARM: uaccess: let UACCESS_GUP_KMAP_MEMCPY enabling afzal mohammed
2020-06-12 10:40 ` [RFC PATCH " afzal mohammed
2020-06-12 10:18 ` [RFC 3/3] ARM: provide CONFIG_VMSPLIT_4G_DEV for development afzal mohammed
2020-06-12 10:38 ` [RFC PATCH " afzal mohammed
2020-06-12 15:19 ` [RFC 0/3] ARM: copy_{from,to}_user() for vmsplit 4g/4g Nicolas Pitre
2020-06-12 15:19 ` Nicolas Pitre
2020-06-12 16:01 ` afzal mohammed [this message]
2020-06-12 16:01 ` afzal mohammed
2020-06-12 16:03 ` afzal mohammed
2020-06-12 16:03 ` afzal mohammed
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