From: Will Deacon <will@kernel.org>
To: Vlastimil Babka <vbabka@suse.cz>
Cc: Prathu Baronia <prathu.baronia@oneplus.com>,
catalin.marinas@arm.com, alexander.duyck@gmail.com,
chintan.pandya@oneplus.com, mhocko@suse.com,
akpm@linux-foundation.org, linux-mm@kvack.org,
gregkh@linuxfoundation.com, gthelen@google.com, jack@suse.cz,
ken.lin@oneplus.com, gasine.xu@oneplus.com, ying.huang@intel.com,
mark.rutland@arm.com
Subject: Re: [PATCH v2] mm: Optimized hugepage zeroing & copying from user
Date: Tue, 21 Apr 2020 14:39:36 +0100 [thread overview]
Message-ID: <20200421133935.GC17875@willie-the-truck> (raw)
In-Reply-To: <02d5daa8-ee7b-7d2d-6753-5191a7d761b9@suse.cz>
On Tue, Apr 21, 2020 at 02:48:04PM +0200, Vlastimil Babka wrote:
> On 4/21/20 2:47 PM, Vlastimil Babka wrote:
> >
> > It was suspected that current Intel can prefetch forward and backwards, and the
> > tested ARM64 microarchitecture only backwards, can it be true? The current code
>
> Oops, tested ARM64 microarchitecture I meant "only forwards".
I'd be surprised if that's the case, but it could be that there's an erratum
workaround in play which hampers the prefetch behaviour. We generally try
not to assume too much about the prefetcher on arm64 because they're not
well documented and vary wildly between different micro-architectures.
Will
next prev parent reply other threads:[~2020-04-21 13:39 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-14 15:38 Prathu Baronia
2020-04-14 17:03 ` Michal Hocko
2020-04-14 17:41 ` Daniel Jordan
[not found] ` <20200414184743.GB2097@oneplus.com>
2020-04-14 19:32 ` Alexander Duyck
2020-04-15 3:40 ` Huang, Ying
2020-04-15 11:09 ` Michal Hocko
2020-04-19 12:05 ` Prathu Baronia
2020-04-14 19:40 ` Michal Hocko
2020-04-15 3:27 ` Huang, Ying
2020-04-16 1:21 ` Huang, Ying
2020-04-19 15:58 ` Prathu Baronia
2020-04-20 0:18 ` Huang, Ying
2020-04-21 9:36 ` Prathu Baronia
2020-04-21 10:09 ` Will Deacon
2020-04-21 12:47 ` Vlastimil Babka
2020-04-21 12:48 ` Vlastimil Babka
2020-04-21 13:39 ` Will Deacon [this message]
2020-04-21 13:48 ` Vlastimil Babka
2020-04-21 13:56 ` Chintan Pandya
2020-04-22 8:18 ` Will Deacon
2020-04-22 11:19 ` Will Deacon
2020-04-22 14:38 ` Prathu Baronia
2020-05-01 8:58 ` Prathu Baronia
2020-05-05 8:59 ` Will Deacon
2020-04-21 13:00 ` Michal Hocko
2020-04-21 13:10 ` Will Deacon
2020-04-17 7:48 ` [mm] 134c8b410f: vm-scalability.median -7.9% regression kernel test robot
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