[PATCH 0/8] Return head pages from find_get_entry and find_lock_entry

Matthew Wilcox (Oracle)
2020-08-19T18:48:42Z

This patch seris started out as part of the THP patch set, but it has
some nice effects along the way and it seems worth splitting it out and
submitting separately.

Currently find_get_entry() and find_lock_entry() return the page
corresponding to the requested index, but the first thing most callers do
is find the head page, which we just threw away. As part of auditing
all the callers, I found some misuses of the APIs and some plain
inefficiencies that I've fixed.

The diffstat is unflattering, but I added more kernel-doc.

Matthew Wilcox (Oracle) (8):
mm: Factor find_get_swap_page out of mincore_page
mm: Use find_get_swap_page in memcontrol
mm: Optimise madvise WILLNEED
proc: Optimise smaps for shmem entries
i915: Use find_lock_page instead of find_lock_entry
mm: Convert find_get_entry to return the head page
mm: Return head page from find_lock_entry
mm: Hoist find_subpage call further up in pagecache_get_page

drivers/gpu/drm/i915/gem/i915_gem_shmem.c | 4 +--
fs/proc/task_mmu.c | 8 +----
include/linux/pagemap.h | 16 +++++++--
include/linux/swap.h | 7 ++++
mm/filemap.c | 41 +++++++++++------------
mm/madvise.c | 21 +++++++-----
mm/memcontrol.c | 25 ++------------
mm/mincore.c | 28 ++--------------
mm/shmem.c | 15 +++++----
mm/swap_state.c | 31 +++++++++++++++++
10 files changed, 98 insertions(+), 98 deletions(-)

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2.28.0