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From: Andrew Morton <akpm@linux-foundation.org>
To: Christopher Lameter <cl@linux.com>
Cc: Wen Yang <wenyang@linux.alibaba.com>,
	Pekka Enberg <penberg@kernel.org>,
	David Rientjes <rientjes@google.com>,
	Joonsoo Kim <iamjoonsoo.kim@lge.com>,
	Xunlei Pang <xlpang@linux.alibaba.com>,
	linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] mm/slub: Detach node lock from counting free objects
Date: Wed, 12 Feb 2020 14:56:15 -0800	[thread overview]
Message-ID: <20200212145615.3518e29ec90d580817c14dc8@linux-foundation.org> (raw)
In-Reply-To: <alpine.DEB.2.21.2002082138070.21534@www.lameter.com>

On Sat, 8 Feb 2020 21:41:49 +0000 (UTC) Christopher Lameter <cl@linux.com> wrote:

> On Sat, 8 Feb 2020, Wen Yang wrote:
> 
> > I would greatly appreciate it if you kindly give me some feedback on this
> > patch.
> 
> I think the measure is too severe given its use and the general impact on code.

Severe in what way?  It's really a quite simple change, although quite
a few edits were needed.

> Maybe avoid taking the lock or reducing the time a lock is taken when reading /proc/slabinfo is
> the best approach?
> 
> Also you could cache the value in the userspace application? Why is this
> value read continually?

: reading "/proc/slabinfo" can possibly block the slab allocation on
: another CPU for a while, 200ms in extreme cases

That was bad of us.  It would be good to stop doing this.


  reply	other threads:[~2020-02-12 22:56 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-01  3:15 [PATCH] mm/slub: Detach node lock from counting free objects Wen Yang
2020-02-08  3:03 ` Wen Yang
2020-02-08 21:41   ` Christopher Lameter
2020-02-12 22:56     ` Andrew Morton [this message]
2020-02-14  2:16       ` Christopher Lameter
2020-02-12 22:52 ` Andrew Morton
2020-02-16  4:15   ` Wen Yang
2020-02-18 20:53     ` Roman Gushchin
2020-02-20 13:53       ` Wen Yang
2020-02-20 15:40         ` Roman Gushchin
2020-02-22  6:55           ` Wen Yang
2020-02-24 17:01             ` Roman Gushchin

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