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From: Yang Shi <shy828301@gmail.com>
To: Hugh Dickins <hughd@google.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	Shakeel Butt <shakeelb@google.com>,
	"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
	Miaohe Lin <linmiaohe@huawei.com>,
	Mike Kravetz <mike.kravetz@oracle.com>,
	Michal Hocko <mhocko@suse.com>, Rik van Riel <riel@surriel.com>,
	Christoph Hellwig <hch@infradead.org>,
	Matthew Wilcox <willy@infradead.org>,
	"Eric W. Biederman" <ebiederm@xmission.com>,
	Alexey Gladkov <legion@kernel.org>,
	Chris Wilson <chris@chris-wilson.co.uk>,
	Matthew Auld <matthew.auld@intel.com>,
	Linux FS-devel Mailing List <linux-fsdevel@vger.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	linux-api@vger.kernel.org, Linux MM <linux-mm@kvack.org>
Subject: Re: [PATCH 09/16] huge tmpfs: decide stat.st_blksize by shmem_is_huge()
Date: Fri, 30 Jul 2021 16:40:54 -0700	[thread overview]
Message-ID: <CAHbLzkp2s+Tkd1kdD4XPU-BF_rDy3Ck7+peTg+WdOWORMjwK-g@mail.gmail.com> (raw)
In-Reply-To: <e6e572-f314-8a43-41a7-7582759d24@google.com>

On Fri, Jul 30, 2021 at 12:51 AM Hugh Dickins <hughd@google.com> wrote:
>
> 4.18 commit 89fdcd262fd4 ("mm: shmem: make stat.st_blksize return huge
> page size if THP is on") added is_huge_enabled() to decide st_blksize:
> now that hugeness can be defined per file, that too needs to be replaced
> by shmem_is_huge().
>
> Unless they have been fcntl'ed F_HUGEPAGE, this does give a different
> answer (No) for small files on a "huge=within_size" mount: but that can
> be considered a minor bugfix.  And a different answer (No) for unfcntl'ed
> files on a "huge=advise" mount: I'm reluctant to complicate it, just to
> reproduce the same debatable answer as before.
>
> Signed-off-by: Hugh Dickins <hughd@google.com>

Reviewed-by: Yang Shi <shy828301@gmail.com>

> ---
>  mm/shmem.c | 12 +-----------
>  1 file changed, 1 insertion(+), 11 deletions(-)
>
> diff --git a/mm/shmem.c b/mm/shmem.c
> index 67a4b7a4849b..f50f2ede71da 100644
> --- a/mm/shmem.c
> +++ b/mm/shmem.c
> @@ -712,15 +712,6 @@ static unsigned long shmem_unused_huge_shrink(struct shmem_sb_info *sbinfo,
>  }
>  #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
>
> -static inline bool is_huge_enabled(struct shmem_sb_info *sbinfo)
> -{
> -       if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE) &&
> -           (shmem_huge == SHMEM_HUGE_FORCE || sbinfo->huge) &&
> -           shmem_huge != SHMEM_HUGE_DENY)
> -               return true;
> -       return false;
> -}
> -
>  /*
>   * Like add_to_page_cache_locked, but error if expected item has gone.
>   */
> @@ -1101,7 +1092,6 @@ static int shmem_getattr(struct user_namespace *mnt_userns,
>  {
>         struct inode *inode = path->dentry->d_inode;
>         struct shmem_inode_info *info = SHMEM_I(inode);
> -       struct shmem_sb_info *sb_info = SHMEM_SB(inode->i_sb);
>
>         if (info->alloced - info->swapped != inode->i_mapping->nrpages) {
>                 spin_lock_irq(&info->lock);
> @@ -1110,7 +1100,7 @@ static int shmem_getattr(struct user_namespace *mnt_userns,
>         }
>         generic_fillattr(&init_user_ns, inode, stat);
>
> -       if (is_huge_enabled(sb_info))
> +       if (shmem_is_huge(NULL, inode, 0))
>                 stat->blksize = HPAGE_PMD_SIZE;
>
>         return 0;
> --
> 2.26.2
>

  reply	other threads:[~2021-07-30 23:41 UTC|newest]

Thread overview: 45+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-30  7:22 [PATCH 00/16] tmpfs: HUGEPAGE and MEM_LOCK fcntls and memfds Hugh Dickins
2021-07-30  7:25 ` [PATCH 01/16] huge tmpfs: fix fallocate(vanilla) advance over huge pages Hugh Dickins
2021-07-30 21:36   ` Yang Shi
2021-08-01  3:38     ` Hugh Dickins
2021-08-02 20:36       ` Yang Shi
2021-07-30  7:28 ` [PATCH 02/16] huge tmpfs: fix split_huge_page() after FALLOC_FL_KEEP_SIZE Hugh Dickins
2021-07-30 23:48   ` Yang Shi
2021-07-30  7:30 ` [PATCH 03/16] huge tmpfs: remove shrinklist addition from shmem_setattr() Hugh Dickins
2021-07-30 21:50   ` Yang Shi
2021-07-30  7:36 ` [PATCH 04/16] huge tmpfs: revert shmem's use of transhuge_vma_enabled() Hugh Dickins
2021-07-30 21:56   ` Yang Shi
2021-08-01  4:01     ` Hugh Dickins
2021-08-02 20:39       ` Yang Shi
2021-07-30  7:39 ` [PATCH 05/16] huge tmpfs: move shmem_huge_enabled() upwards Hugh Dickins
2021-07-30 21:57   ` Yang Shi
2021-07-30  7:42 ` [PATCH 06/16] huge tmpfs: shmem_is_huge(vma, inode, index) Hugh Dickins
2021-07-30 23:34   ` Yang Shi
2021-08-01  5:22     ` Hugh Dickins
2021-08-01  5:37       ` Hugh Dickins
2021-08-02 21:14       ` Yang Shi
2021-08-04  8:28         ` Hugh Dickins
2021-08-04 19:01           ` Yang Shi
2021-08-06  5:21             ` Hugh Dickins
2021-08-06 17:41               ` Yang Shi
2021-08-05 23:04         ` Yang Shi
2021-08-06  5:43           ` Hugh Dickins
2021-08-06 17:57             ` Yang Shi
2021-08-12 18:19               ` Yang Shi
2021-07-30  7:45 ` [PATCH 07/16] memfd: memfd_create(name, MFD_HUGEPAGE) for shmem huge pages Hugh Dickins
2021-08-04 14:03   ` Kirill A. Shutemov
2021-08-06  3:33     ` Hugh Dickins
2021-07-30  7:48 ` [PATCH 08/16] huge tmpfs: fcntl(fd, F_HUGEPAGE) and fcntl(fd, F_NOHUGEPAGE) Hugh Dickins
2021-08-04 14:08   ` Kirill A. Shutemov
2021-08-06  4:34     ` Hugh Dickins
2021-07-30  7:51 ` [PATCH 09/16] huge tmpfs: decide stat.st_blksize by shmem_is_huge() Hugh Dickins
2021-07-30 23:40   ` Yang Shi [this message]
2021-07-30  7:55 ` [PATCH 10/16] tmpfs: fcntl(fd, F_MEM_LOCK) to memlock a tmpfs file Hugh Dickins
2021-08-03  1:38   ` Matthew Wilcox
2021-08-04  9:15     ` Hugh Dickins
2021-07-30  7:57 ` [PATCH 11/16] tmpfs: fcntl(fd, F_MEM_LOCKED) to test if memlocked Hugh Dickins
2021-07-30  8:00 ` [PATCH 12/16] tmpfs: refuse memlock when fallocated beyond i_size Hugh Dickins
2021-07-30  8:03 ` [PATCH 13/16] mm: bool user_shm_lock(loff_t size, struct ucounts *) Hugh Dickins
2021-07-30  8:06 ` [PATCH 14/16] mm: user_shm_lock(,,getuc) and user_shm_unlock(,,putuc) Hugh Dickins
2021-07-30  8:09 ` [PATCH 15/16] tmpfs: permit changing size of memlocked file Hugh Dickins
2021-07-30  8:13 ` [PATCH 16/16] memfd: memfd_create(name, MFD_MEM_LOCK) for memlocked shmem Hugh Dickins

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