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authorHugh Dickins <hughd@google.com>2021-09-03 00:54:24 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2021-09-03 19:58:11 +0300
commit2b5bbcb1c9c2cd05a06dcf54df77255a8c406a7b (patch)
treeec528d6fab4000da938c88c3e6bdab1dcbb242ec /mm/shmem.c
parentd144bf6205342a4b5fed5d204ae18849a4de741b (diff)
downloadlinux-2b5bbcb1c9c2cd05a06dcf54df77255a8c406a7b.tar.xz
huge tmpfs: remove shrinklist addition from shmem_setattr()
There's a block of code in shmem_setattr() to add the inode to shmem_unused_huge_shrink()'s shrinklist when lowering i_size: it dates from before 5.7 changed truncation to do split_huge_page() for itself, and should have been removed at that time. I am over-stating that: split_huge_page() can fail (notably if there's an extra reference to the page at that time), so there might be value in retrying. But there were already retries as truncation worked through the tails, and this addition risks repeating unsuccessful retries indefinitely: I'd rather remove it now, and work on reducing the chance of split_huge_page() failures separately, if we need to. Link: https://lkml.kernel.org/r/b73b3492-8822-18f9-83e2-938528cdde94@google.com Fixes: 71725ed10c40 ("mm: huge tmpfs: try to split_huge_page() when punching hole") Signed-off-by: Hugh Dickins <hughd@google.com> Reviewed-by: Yang Shi <shy828301@gmail.com> Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Miaohe Lin <linmiaohe@huawei.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Mike Kravetz <mike.kravetz@oracle.com> Cc: Rik van Riel <riel@surriel.com> Cc: Shakeel Butt <shakeelb@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/shmem.c')
-rw-r--r--mm/shmem.c19
1 files changed, 0 insertions, 19 deletions
diff --git a/mm/shmem.c b/mm/shmem.c
index e391325dfc21..9403048f4ee1 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -1058,7 +1058,6 @@ static int shmem_setattr(struct user_namespace *mnt_userns,
{
struct inode *inode = d_inode(dentry);
struct shmem_inode_info *info = SHMEM_I(inode);
- struct shmem_sb_info *sbinfo = SHMEM_SB(inode->i_sb);
int error;
error = setattr_prepare(&init_user_ns, dentry, attr);
@@ -1094,24 +1093,6 @@ static int shmem_setattr(struct user_namespace *mnt_userns,
if (oldsize > holebegin)
unmap_mapping_range(inode->i_mapping,
holebegin, 0, 1);
-
- /*
- * Part of the huge page can be beyond i_size: subject
- * to shrink under memory pressure.
- */
- if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE)) {
- spin_lock(&sbinfo->shrinklist_lock);
- /*
- * _careful to defend against unlocked access to
- * ->shrink_list in shmem_unused_huge_shrink()
- */
- if (list_empty_careful(&info->shrinklist)) {
- list_add_tail(&info->shrinklist,
- &sbinfo->shrinklist);
- sbinfo->shrinklist_len++;
- }
- spin_unlock(&sbinfo->shrinklist_lock);
- }
}
}