Current filemap_map_pages() still use page granularity
even when the underneath folio is large folio. Making it
use folio based granularity allows batched refcount,
rmap and mm counter opertion. Which brings some level
performance gain. This series tries to update
filemap_map_pages()
do_set_pte()
page_add_file_rmap()
to bring batched refcount, rmap and mm counter in.
Patch 1 enabled the fault around for shared file page
write fault. As David suggested here:
https://lore.kernel.org/linux-mm/e14b4e9a-612d-fc02-edc0-8f3b6bcf4148@xxxxxxxxxx/
Patch 2 update filemap_map_pages() to do map based on
folio granularity and batched refcount update
Patch 3,4,5 Enable batched rmap and mm counter
Function testing:
- two days daily usage: boot to xfs GUI, kernel build, editor and browser
Performance testing:
- kernel build: no obvious performance impact
- micro benchmark: will-it-scale:page_fault3 (shared file write fault)
Patch 1 brings 3.75X performance gain
- micro benchmark: will-it-scale:page_fault3 like but with file read fault
- Patch 2 brings about 2% performance gain (batched refcount)
- Patch 3,4,5 brings about 15% performance gain (batched rmap and mm counter)
Yin Fengwei (5):
mm: Enable fault around for shared file page fault
filemap: do file page mapping with folio granularity
rmap: add page_add_file_rmap_range()
mm: add do_set_pte_entry()
filemap: batched update mm counter,rmap when map file folio
include/linux/mm.h | 2 +
include/linux/rmap.h | 2 +
mm/filemap.c | 106 +++++++++++++++++++++++++++++--------------
mm/memory.c | 25 +++++++++-
mm/rmap.c | 70 +++++++++++++++++-----------
5 files changed, 143 insertions(+), 62 deletions(-)
--
2.30.2
