From: Prathu Baronia <prathu.baronia@oneplus.com>
To: "Huang, Ying" <ying.huang@intel.com>
Cc: alexander.duyck@gmail.com, chintan.pandya@oneplus.com,
mhocko@suse.com, akpm@linux-foundation.com, linux-mm@kvack.org,
gregkh@linuxfoundation.com, gthelen@google.com, jack@suse.cz,
ken.lin@oneplus.com, gasine.xu@oneplus.com
Subject: Re: [PATCH v2] mm: Optimized hugepage zeroing & copying from user
Date: Sun, 19 Apr 2020 21:28:57 +0530 [thread overview]
Message-ID: <20200419155856.dtwxomdkyujljdfi@oneplus.com> (raw)
In-Reply-To: <87r1wpzavo.fsf@yhuang-dev.intel.com>
The 04/15/2020 11:27, Huang, Ying wrote:
>
> Can you describe your test?
>
We profile the clear_huge_page() using ftrace while parallely force triggering it by a simple
userspace test code which allocates 100MB of anon memory and traverses through
it in loop.
>
> You have tested the chunk sizes 4KB and 2MB, can you test some values in
> between? For example 32KB or 64KB? Maybe there's a sweet point with
> some smaller granularity and good performance.
Based on your advise I tried chunk sizes of 4KB, 8KB, 16KB, 32KB and 64KB on
arm64 and x86_64 by copying the kernel memset implementation for both the archs.
-------------------------------------------------------------------------------
Results(the sample size is 100 for each and the values are in us):-
-------------------------------------------------------------------------------
ARM64(CPU0 & 6 on and set at max frequency, DDR set to performance governor):-
-------------------------------------------------------------------------------
Chunk Size = 4KB
-----------------
Oneshot
Mean : 3402.06
Stddev : 72.6576
Forward
Mean : 3408.04
Stddev : 72.976
Reverse
Mean : 17699.3
Stddev : 132.875
-----------------
Chunk Size = 8KB
-----------------
Oneshot
Mean : 3398.64
Stddev : 80.6334
Forward
Mean : 3391.58
Stddev : 65.9063
Reverse
Mean : 13909.2
Stddev : 194.324
-----------------
Chunk Size = 16KB
-----------------
Oneshot
Mean : 3393.57
Stddev : 72.2485
Forward
Mean : 3404.69
Stddev : 84.4705
Reverse
Mean : 9278.65
Stddev : 217.725
-----------------
Chunk Size = 32KB
-----------------
Oneshot
Mean : 3425.7
Stddev : 129.156
Forward
Mean : 3402.07
Stddev : 82.6713
Reverse
Mean : 6831.43
Stddev : 184.807
-----------------
Chunk Size = 64KB
-----------------
Oneshot
Mean : 3398.72
Stddev : 77.9703
Forward
Mean : 3413.52
Stddev : 173.121
Reverse
Mean : 5542.84
Stddev : 197.017
---------------------------------------------
x86_64(Only CPU0 on and set to max frequency)
---------------------------------------------
Chunk Size = 4KB
-----------------
Oneshot
Mean : 6752.59
Stddev : 298.988
Forward
Mean : 6873.6
Stddev : 325.607
Reverse
Mean : 6722.88
Stddev : 365.837
-----------------
Chunk Size = 8KB
-----------------
Oneshot
Mean : 6848.57
Stddev : 955.312
Forward
Mean : 7012.24
Stddev : 1377.27
Reverse
Mean : 6688.83
Stddev : 589.935
-----------------
Chunk Size = 16KB
-----------------
Oneshot
Mean : 6846.87
Stddev : 546.173
Forward
Mean : 6785.26
Stddev : 248.022
Reverse
Mean : 6613.33
Stddev : 350.003
-----------------
Chunk Size = 32KB
-----------------
Oneshot
Mean : 6862.19
Stddev : 870.524
Forward
Mean : 6826.3
Stddev : 870.023
Reverse
Mean : 6747.69
Stddev : 1047.5
-----------------
Chunk Size = 64KB
-----------------
Oneshot
Mean : 6806.9
Stddev : 609.112
Forward
Mean : 6774.53
Stddev : 311.954
Reverse
Mean : 6553.47
Stddev : 293.52
--
Prathu Baronia
OnePlus RnD
next prev parent reply other threads:[~2020-04-19 15:59 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-14 15:38 [PATCH v2] mm: Optimized hugepage zeroing & copying from user 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 [this message]
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
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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