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From: Michal Hocko <>
To:, Yang Shi <>
Subject: Re: [RFC v2 PATCH] mm: shmem: make stat.st_blksize return huge page size if THP is on
Date: Mon, 23 Apr 2018 09:04:35 -0600	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On Sun 22-04-18 21:28:59, Yang Shi wrote:
> On 4/22/18 6:47 PM, Michal Hocko wrote:
> > will be used on the first aligned address even when the initial/last
> > portion of the mapping is not THP aligned.
> No, my test shows it is not. And, transhuge_vma_suitable() does check the
> virtual address alignment. If it is not huge page size aligned, it will not
> set PMD for huge page.

It's been quite some time since I've looked at that code but I think you
are wrong. It just doesn't make sense to make the THP decision on the
VMA alignment much. Kirill, can you clarify please?

Please note that I have no objections to actually export the huge page
size as the max block size but your changelog just doesn't make any
sense to me.
Michal Hocko

  reply	other threads:[~2018-04-23 15:04 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-20 16:33 [RFC v2 PATCH] mm: shmem: make stat.st_blksize return huge page size if THP is on Yang Shi
2018-04-23  0:47 ` Michal Hocko
2018-04-23  3:28   ` Yang Shi
2018-04-23 15:04     ` Michal Hocko [this message]
2018-04-23 16:19       ` Yang Shi
2018-04-24  3:41       ` Yang Shi
2018-04-24 12:43         ` Michal Hocko
2018-04-24 13:08           ` Yang Shi

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