From: Thomas Gleixner <tglx@linutronix.de>
To: Paul Menzel <pmenzel+linux-mm@molgen.mpg.de>
Cc: linux-mm@kvack.org, x86@kernel.org
Subject: Re: How to profile 160 ms spent in `add_highpages_with_active_regions()`?
Date: Wed, 22 Aug 2018 15:41:52 +0200 (CEST) [thread overview]
Message-ID: <alpine.DEB.2.21.1808221539190.1652@nanos.tec.linutronix.de> (raw)
In-Reply-To: <4f8d0de0-e9f1-e3cd-1f94-e95e6fa47ecf@molgen.mpg.de>
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On Wed, 22 Aug 2018, Paul Menzel wrote:
> Am 21.08.2018 um 11:37 schrieb Paul Menzel:
> > [Removed non-working Pavel Tatashin <pasha.tatashin@oracle.com>]
>
> So a??freea??inga?? pfn = 225278 to e_pfn = 818492 in the for loop takes 160 ms.
That's 593214 pages and each one takes about 270ns. I don't see much
optimization potential with that.
32bit and highmem sucks ...
next prev parent reply other threads:[~2018-08-22 13:41 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-17 8:12 Paul Menzel
2018-08-21 9:37 ` Paul Menzel
2018-08-22 13:25 ` Paul Menzel
2018-08-22 13:41 ` Thomas Gleixner [this message]
2018-09-04 9:16 ` Paul Menzel
2018-09-13 12:04 ` Thomas Gleixner
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