The patch titled
Subject: mm/khugepaged: convert is_refcount_suitable() to use folios
has been added to the -mm mm-unstable branch. Its filename is
mm-khugepaged-convert-is_refcount_suitable-to-use-folios.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-khugepaged-convert-is_refcount_suitable-to-use-folios.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next via the mm-everything
branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there every 2-3 working days
------------------------------------------------------
From: "Vishal Moola (Oracle)" <vishal.moola@xxxxxxxxx>
Subject: mm/khugepaged: convert is_refcount_suitable() to use folios
Date: Fri, 20 Oct 2023 11:33:29 -0700
Both callers of is_refcount_suitable() have been converted to use
folios, so convert it to take in a folio. Both callers only operate on
head pages of folios so mapcount/refcount conversions here are trivial.
Removes 3 calls to compound head, and removes 315 bytes of kernel text.
Link: https://lkml.kernel.org/r/20231020183331.10770-4-vishal.moola@xxxxxxxxx
Signed-off-by: Vishal Moola (Oracle) <vishal.moola@xxxxxxxxx>
Cc: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
Cc: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Cc: Yang Shi <shy828301@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/khugepaged.c | 14 +++++++-------
1 file changed, 7 insertions(+), 7 deletions(-)
--- a/mm/khugepaged.c~mm-khugepaged-convert-is_refcount_suitable-to-use-folios
+++ a/mm/khugepaged.c
@@ -524,15 +524,15 @@ static void release_pte_pages(pte_t *pte
}
}
-static bool is_refcount_suitable(struct page *page)
+static bool is_refcount_suitable(struct folio *folio)
{
int expected_refcount;
- expected_refcount = total_mapcount(page);
- if (PageSwapCache(page))
- expected_refcount += compound_nr(page);
+ expected_refcount = folio_mapcount(folio);
+ if (folio_test_swapcache(folio))
+ expected_refcount += folio_nr_pages(folio);
- return page_count(page) == expected_refcount;
+ return folio_ref_count(folio) == expected_refcount;
}
static int __collapse_huge_page_isolate(struct vm_area_struct *vma,
@@ -625,7 +625,7 @@ static int __collapse_huge_page_isolate(
* but not from this process. The other process cannot write to
* the page, only trigger CoW.
*/
- if (!is_refcount_suitable(&folio->page)) {
+ if (!is_refcount_suitable(folio)) {
folio_unlock(folio);
result = SCAN_PAGE_COUNT;
goto out;
@@ -1371,7 +1371,7 @@ static int hpage_collapse_scan_pmd(struc
* has excessive GUP pins (i.e. 512). Anyway the same check
* will be done again later the risk seems low.
*/
- if (!is_refcount_suitable(&folio->page)) {
+ if (!is_refcount_suitable(folio)) {
result = SCAN_PAGE_COUNT;
goto out_unmap;
}
_
Patches currently in -mm which might be from vishal.moola@xxxxxxxxx are
mm-khugepaged-convert-__collapse_huge_page_isolate-to-use-folios.patch
mm-khugepaged-convert-hpage_collapse_scan_pmd-to-use-folios.patch
mm-khugepaged-convert-is_refcount_suitable-to-use-folios.patch
mm-khugepaged-convert-alloc_charge_hpage-to-use-folios.patch
mm-khugepaged-convert-collapse_pte_mapped_thp-to-use-folios.patch
