diff options
author | Vishal Moola (Oracle) <vishal.moola@gmail.com> | 2023-01-30 12:18:28 -0800 |
---|---|---|
committer | Andrew Morton <akpm@linux-foundation.org> | 2023-02-13 15:54:30 -0800 |
commit | fa4e3f5ffa5e6e22f751d289c9afa502dda30b8d (patch) | |
tree | b7c96196b4d29a0e16bbc957cb0067f61cca09fd /mm/mempolicy.c | |
parent | 192a50220342f82826812d0032a82fe441e924e2 (diff) | |
download | linux-fa4e3f5ffa5e6e22f751d289c9afa502dda30b8d.tar.gz |
mm: add folio_estimated_sharers()
Patch series "Convert various mempolicy.c functions to use folios", v4.
This patch series converts migrate_page_add() and queue_pages_required()
to migrate_folio_add() and queue_page_required(). It also converts the
callers of the functions to use folios as well, and introduces a helper
function to estimate the number of sharers of a folio.
This patch (of 6):
folio_estimated_sharers() takes in a folio and returns the precise number
of times the first subpage of the folio is mapped.
This function aims to provide an estimate for the number of sharers of a
folio. This is necessary for folio conversions where we care about the
number of processes that share a folio, but don't necessarily want to
check every single page within that folio.
This is in contrast to folio_mapcount() which calculates the total number
of the times a folio and all its subpages are mapped.
Link: https://lkml.kernel.org/r/20230130201833.27042-1-vishal.moola@gmail.com
Link: https://lkml.kernel.org/r/20230130201833.27042-2-vishal.moola@gmail.com
Signed-off-by: Vishal Moola (Oracle) <vishal.moola@gmail.com>
Reviewed-by: Yin Fengwei <fengwei.yin@intel.com>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: Jane Chu <jane.chu@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/mempolicy.c')
0 files changed, 0 insertions, 0 deletions