From: marc@tensilica.com (Marc Gauthier)
To: linux-arm-kernel@lists.infradead.org
Subject: [Linux-Xtensa] Re: sched_clock always 0 and no process time accounting with 3.11-rc1
Date: Wed, 17 Jul 2013 08:15:08 -0700 [thread overview]
Message-ID: <8572CFB6-0D88-46F4-B055-7834F8B9BDA5@tensilica.com> (raw)
In-Reply-To: <20130717061925.GC6950@tarshish>
Hi Baruch,
On 2013-07-16, at 11:19 PM, Baruch Siach <baruch@tkos.co.il> wrote:
> - sched_clock_mask = (1 << bits) - 1;
> + sched_clock_mask = (1ULL << bits) - 1;
Might it be more efficient to use:
sched_clock_mask = 0xffffffff >> (32 - bits);
to avoid using 64 bit ints?
(assuming bits > 0, didn't check)
-Marc
next prev parent reply other threads:[~2013-07-17 15:15 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CAMo8BfLO31GgMMA_hENr0xm=qaUz3EVLtaQ8hewiQHdbV+s6sA@mail.gmail.com>
2013-07-17 6:19 ` sched_clock always 0 and no process time accounting with 3.11-rc1 Baruch Siach
2013-07-17 6:39 ` Max Filippov
2013-07-17 6:47 ` [Linux-Xtensa] " Baruch Siach
2013-07-17 7:02 ` Chris Zankel
2013-07-17 7:14 ` Baruch Siach
2013-07-17 9:03 ` Russell King - ARM Linux
2013-07-17 9:12 ` Baruch Siach
2013-07-17 9:15 ` Russell King - ARM Linux
2013-07-17 15:15 ` Marc Gauthier [this message]
2013-07-17 15:24 ` [Linux-Xtensa] " Russell King - ARM Linux
2013-07-17 16:17 ` Marc Gauthier
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