From: Kevin Liu <kevin@potatofrom.space>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: bugzilla-daemon@bugzilla.kernel.org, linux-mm@kvack.org
Subject: Re: [Bug 200627] New: Stutters and high kernel CPU usage from list_lru_count_one when cache fills memory
Date: Mon, 23 Jul 2018 01:52:12 +0000 (UTC) [thread overview]
Message-ID: <a38b9753-58c5-b128-8d40-abb49f690e4c@potatofrom.space> (raw)
In-Reply-To: <63e10f4d-ad8f-8d02-2f78-caf01eaa72c1@potatofrom.space>
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Correction - after using 4.14.53 for a while, I do actually see
list_lru_count_one at the top, but only at ~10% overhead. The
responsiveness is slightly degraded, but still better than how it was on
4.18-rc4.
On 07/22/2018 08:02 PM, Kevin Liu wrote:
> Sorry, not sure if the previous message registered on bugzilla due to
> the pgp signature? Including it below.
>
> On 07/22/2018 07:44 PM, Kevin Liu wrote:
>>> How recently? Were earlier kernels better behaved?
>> I've seen this issue both on Linux 4.16.15 (admittedly using the -ck
>> patchset) and on vanilla Linux 4.18-rc4 (which is what I'm currently using).
>>
>> I'm fairly certain that it did not occur on Linux 4.14.50, which I used
>> previously, but I will boot back into it to double-check and let you know.
>>
>
> And yes, booted back into Linux 4.14.54, there appears to be no issue --
> list_lru_count_one reaches 6% overhead at most:
>
> Overhead Shared Object Symbol
>
> 5.91% [kernel] [k] list_lru_count_one
>
> 5.13% [kernel] [k] nmi
>
> 4.08% [kernel] [k] read_hpet
>
> 1.26% zma [.] Zone::CheckAlarms
>
> 1.16% [kernel] [k] _raw_spin_lock
>
> 1.07% restic [.] 0x00000000002e696c
>
> 1.06% .perf-wrapped [.] hpp__sort_overhead
>
>
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prev parent reply other threads:[~2018-07-23 1:52 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <bug-200627-27@https.bugzilla.kernel.org/>
2018-07-22 23:40 ` Andrew Morton
2018-07-22 23:44 ` Kevin Liu
2018-07-23 0:02 ` Kevin Liu
2018-07-23 1:52 ` Kevin Liu [this message]
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