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From: Yang Shi <shy828301@gmail.com>
To: Hugh Dickins <hughd@google.com>
Cc: Matthew Wilcox <willy@infradead.org>,
	"Huang, Ying" <ying.huang@intel.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	David Hildenbrand <david@redhat.com>,
	Linux MM <linux-mm@kvack.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Miaohe Lin <linmiaohe@huawei.com>,
	Johannes Weiner <hannes@cmpxchg.org>,
	Michal Hocko <mhocko@suse.com>,
	Joonsoo Kim <iamjoonsoo.kim@lge.com>,
	Minchan Kim <minchan@kernel.org>
Subject: Re: [PATCH] mm,shmem: Fix a typo in shmem_swapin_page()
Date: Mon, 9 Aug 2021 14:26:49 -0700	[thread overview]
Message-ID: <CAHbLzko7LJmxkVuZTX35Aj65V29ukXmioJtrkiTtGrTyK9q7Sw@mail.gmail.com> (raw)
In-Reply-To: <CAHbLzkrqY=L2bEeEfAkApkoz=sRUk-Nk_KBDWGAbsqapY+xG1Q@mail.gmail.com>

On Fri, Aug 6, 2021 at 1:37 PM Yang Shi <shy828301@gmail.com> wrote:
>
> On Thu, Aug 5, 2021 at 11:01 PM Hugh Dickins <hughd@google.com> wrote:
> >
> > On Thu, 5 Aug 2021, Yang Shi wrote:
> > > On Tue, Aug 3, 2021 at 10:34 PM Hugh Dickins <hughd@google.com> wrote:
> > > >
> > > > I've never seen the swapoff race claimed by Miaohe, and don't expect to;
> > > > but he's probably right, given the current code.  I just dislike adding
> > > > unnecessary complexity, and siting it in the wrong place (mm/shmem.c).
> > > >
> > > > Yang, is it possible that 5.1 commit 8fd2e0b505d1 ("mm: swap: check if
> > > > swap backing device is congested or not") was actually developed and
> > > > measured on 4.1 or earlier, which still had blk_set_queue_congested()?
> > >
> > > I forgot the exact version, but definitely not 4.1 or earlier. Maybe
> > > 4.19 or earlier. I'm not familiar with how block layer detect
> > > congestion, if the logic was changed, hence the optimization doesn't
> > > stand anymore nowadays, I'm totally fine to remove it.
> >
> > You drove me back to look more closely.  blk_set_queue_congested()
> > vanished from include/linux/blkdev.h in 4.2, but blk_set_congested()
> > appeared then in block/blk-core.c to replace it.  blk_set_congested()
> > vanished (along with all references to "congested" in blk-core.c) in
> > 5.0, then your commit (most probably tested on 4.19) went into 5.1 -
> > just after it had become redundant!
> >
> > Thanks, yes, let's revert that and Miaohe's and Huang's, later on.
>
> It should be easier to revert Huang Ying's , then Miaohe's, then mine.

Hi Ying,

I just prepared the reverts since I need to revert yours and Miaohe's
in order to revert my problematic commit.

>
> >
> > Hugh

  reply	other threads:[~2021-08-09 21:27 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-23  8:00 Huang Ying
2021-07-23 11:10 ` David Hildenbrand
2021-07-23 20:23 ` Hugh Dickins
2021-07-23 21:53   ` Matthew Wilcox
2021-08-03  8:14     ` Huang, Ying
2021-08-03 12:01       ` Matthew Wilcox
2021-08-04  5:34         ` Hugh Dickins
2021-08-04  9:04           ` Huang, Ying
2021-08-05 23:08           ` Yang Shi
2021-08-06  6:01             ` Hugh Dickins
2021-08-06 20:37               ` Yang Shi
2021-08-09 21:26                 ` Yang Shi [this message]
2021-08-09 23:43                   ` Huang, Ying
2021-08-10  1:11                     ` Yang Shi
2021-08-04  9:01         ` Huang, Ying
2021-07-28 13:03   ` huang ying
2021-08-03  8:06     ` Huang, Ying
2021-08-03 11:59       ` Matthew Wilcox
2021-08-04  4:28       ` Hugh Dickins
2021-08-04  6:42     ` Hugh Dickins
2021-08-04  8:59       ` Huang, Ying

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