From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: Yury Norov <yury.norov@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
"H. Peter Anvin" <hpa@zytor.com>,
Lucas Stach <l.stach@pengutronix.de>,
Russell King <linux+etnaviv@armlinux.org.uk>,
Christian Gmeiner <christian.gmeiner@gmail.com>,
David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>,
Jean Delvare <jdelvare@suse.com>,
Guenter Roeck <linux@roeck-us.net>,
Rasmus Villemoes <linux@rasmusvillemoes.dk>,
Marc Zyngier <maz@kernel.org>,
David Woodhouse <dwmw@amazon.co.uk>,
Andrew Morton <akpm@linux-foundation.org>,
Wei Yang <richard.weiyang@linux.alibaba.com>,
Geert Uytterhoeven <geert+renesas@glider.be>,
Alexey Klimov <aklimov@redhat.com>,
x86@kernel.org, linux-kernel@vger.kernel.org,
etnaviv@lists.freedesktop.org, dri-devel@lists.freedesktop.org,
linux-hwmon@vger.kernel.org
Subject: Re: [PATCH 2/3] find: micro-optimize for_each_{set,clear}_bit()
Date: Sat, 19 Jun 2021 13:50:17 +0300 [thread overview]
Message-ID: <YM3L6fAhEmgYgle7@smile.fi.intel.com> (raw)
In-Reply-To: <20210618195735.55933-3-yury.norov@gmail.com>
On Fri, Jun 18, 2021 at 12:57:34PM -0700, Yury Norov wrote:
> The macros iterate thru all set/clear bits in a bitmap. They search a
> first bit using find_first_bit(), and the rest bits using find_next_bit().
>
> Since find_next_bit() is called shortly after find_first_bit(), we can
> save few lines of I-cache by not using find_first_bit().
Any number available?
--
With Best Regards,
Andy Shevchenko
WARNING: multiple messages have this Message-ID (diff)
From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: Yury Norov <yury.norov@gmail.com>
Cc: Wei Yang <richard.weiyang@linux.alibaba.com>,
Geert Uytterhoeven <geert+renesas@glider.be>,
David Airlie <airlied@linux.ie>,
Rasmus Villemoes <linux@rasmusvillemoes.dk>,
dri-devel@lists.freedesktop.org, "H. Peter Anvin" <hpa@zytor.com>,
Marc Zyngier <maz@kernel.org>,
x86@kernel.org, Ingo Molnar <mingo@redhat.com>,
Russell King <linux+etnaviv@armlinux.org.uk>,
Guenter Roeck <linux@roeck-us.net>,
Jean Delvare <jdelvare@suse.com>,
Alexey Klimov <aklimov@redhat.com>,
etnaviv@lists.freedesktop.org, Borislav Petkov <bp@alien8.de>,
Thomas Gleixner <tglx@linutronix.de>,
linux-hwmon@vger.kernel.org, linux-kernel@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>,
David Woodhouse <dwmw@amazon.co.uk>
Subject: Re: [PATCH 2/3] find: micro-optimize for_each_{set,clear}_bit()
Date: Sat, 19 Jun 2021 13:50:17 +0300 [thread overview]
Message-ID: <YM3L6fAhEmgYgle7@smile.fi.intel.com> (raw)
In-Reply-To: <20210618195735.55933-3-yury.norov@gmail.com>
On Fri, Jun 18, 2021 at 12:57:34PM -0700, Yury Norov wrote:
> The macros iterate thru all set/clear bits in a bitmap. They search a
> first bit using find_first_bit(), and the rest bits using find_next_bit().
>
> Since find_next_bit() is called shortly after find_first_bit(), we can
> save few lines of I-cache by not using find_first_bit().
Any number available?
--
With Best Regards,
Andy Shevchenko
next prev parent reply other threads:[~2021-06-19 10:50 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-18 19:57 [PATCH 0/3] for_each_*_bit: move to find.h and reconsider Yury Norov
2021-06-18 19:57 ` [PATCH 1/3] include/linux: move for_each_bit() macros from bitops.h to find.h Yury Norov
2021-06-19 10:50 ` Andy Shevchenko
2021-06-19 10:50 ` Andy Shevchenko
2021-06-18 19:57 ` [PATCH 2/3] find: micro-optimize for_each_{set,clear}_bit() Yury Norov
2021-06-19 10:50 ` Andy Shevchenko [this message]
2021-06-19 10:50 ` Andy Shevchenko
2021-06-19 16:24 ` Marc Zyngier
2021-06-19 16:24 ` Marc Zyngier
2021-06-19 17:28 ` Yury Norov
2021-06-19 17:28 ` Yury Norov
2021-06-27 16:47 ` Yury Norov
2021-06-27 16:47 ` Yury Norov
2021-06-18 19:57 ` [PATCH 3/3] Replace for_each_*_bit_from() with for_each_*_bit() where appropriate Yury Norov
2021-06-19 10:49 ` Andy Shevchenko
2021-06-19 10:49 ` Andy Shevchenko
2021-06-19 10:55 ` Andy Shevchenko
2021-06-19 10:55 ` Andy Shevchenko
2021-06-21 20:17 ` Guenter Roeck
2021-06-21 20:17 ` Guenter Roeck
2021-06-21 21:34 ` Yury Norov
2021-06-21 21:34 ` Yury Norov
2021-07-28 14:57 ` [PATCH 0/3] for_each_*_bit: move to find.h and reconsider Yury Norov
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