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| author | Matthew Wilcox (Oracle) <willy@infradead.org> | 2020-10-13 16:51:28 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-10-13 18:38:29 -0700 |
| commit | 8cf886463ecc621688a9c81c387d0f9ed32e45ea (patch) | |
| tree | a4ce853191706a1c3e7a827e36260e4b218e6497 /fs | |
| parent | e6e88712e43b7942df451508aafc2f083266f56b (diff) | |
| download | lwn-8cf886463ecc621688a9c81c387d0f9ed32e45ea.tar.gz lwn-8cf886463ecc621688a9c81c387d0f9ed32e45ea.zip | |
proc: optimise smaps for shmem entries
Avoid bumping the refcount on pages when we're only interested in the
swap entries.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Huang Ying <ying.huang@intel.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Matthew Auld <matthew.auld@intel.com>
Cc: William Kucharski <william.kucharski@oracle.com>
Link: https://lkml.kernel.org/r/20200910183318.20139-5-willy@infradead.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/proc/task_mmu.c | 8 |
1 files changed, 1 insertions, 7 deletions
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index 35172a91148e..a1be198f755c 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -520,16 +520,10 @@ static void smaps_pte_entry(pte_t *pte, unsigned long addr, page = device_private_entry_to_page(swpent); } else if (unlikely(IS_ENABLED(CONFIG_SHMEM) && mss->check_shmem_swap && pte_none(*pte))) { - page = find_get_entry(vma->vm_file->f_mapping, + page = xa_load(&vma->vm_file->f_mapping->i_pages, linear_page_index(vma, addr)); - if (!page) - return; - if (xa_is_value(page)) mss->swap += PAGE_SIZE; - else - put_page(page); - return; } |