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authorJohannes Weiner <hannes@cmpxchg.org>2020-06-04 01:01:31 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2020-06-04 05:09:47 +0200
commit3fba69a56e16e8dcf182fe6ca77735dd65a898aa (patch)
treec992db06268296ead7fa8b36f62b1ebb8505bbf3 /kernel/events/uprobes.c
parentmm: memcontrol: fix stat-corrupting race in charge moving (diff)
downloadlinux-3fba69a56e16e8dcf182fe6ca77735dd65a898aa.tar.xz
linux-3fba69a56e16e8dcf182fe6ca77735dd65a898aa.zip
mm: memcontrol: drop @compound parameter from memcg charging API
The memcg charging API carries a boolean @compound parameter that tells whether the page we're dealing with is a hugepage. mem_cgroup_commit_charge() has another boolean @lrucare that indicates whether the page needs LRU locking or not while charging. The majority of callsites know those parameters at compile time, which results in a lot of naked "false, false" argument lists. This makes for cryptic code and is a breeding ground for subtle mistakes. Thankfully, the huge page state can be inferred from the page itself and doesn't need to be passed along. This is safe because charging completes before the page is published and somebody may split it. Simplify the callsites by removing @compound, and let memcg infer the state by using hpage_nr_pages() unconditionally. That function does PageTransHuge() to identify huge pages, which also helpfully asserts that nobody passes in tail pages by accident. The following patches will introduce a new charging API, best not to carry over unnecessary weight. Signed-off-by: Johannes Weiner <hannes@cmpxchg.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: Alex Shi <alex.shi@linux.alibaba.com> Reviewed-by: Joonsoo Kim <iamjoonsoo.kim@lge.com> Reviewed-by: Shakeel Butt <shakeelb@google.com> Cc: Hugh Dickins <hughd@google.com> Cc: "Kirill A. Shutemov" <kirill@shutemov.name> Cc: Michal Hocko <mhocko@suse.com> Cc: Roman Gushchin <guro@fb.com> Cc: Balbir Singh <bsingharora@gmail.com> Link: http://lkml.kernel.org/r/20200508183105.225460-4-hannes@cmpxchg.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/events/uprobes.c')
-rw-r--r--kernel/events/uprobes.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index ece7e13f6e4a..40e7488ce467 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -169,7 +169,7 @@ static int __replace_page(struct vm_area_struct *vma, unsigned long addr,
if (new_page) {
err = mem_cgroup_try_charge(new_page, vma->vm_mm, GFP_KERNEL,
- &memcg, false);
+ &memcg);
if (err)
return err;
}
@@ -181,7 +181,7 @@ static int __replace_page(struct vm_area_struct *vma, unsigned long addr,
err = -EAGAIN;
if (!page_vma_mapped_walk(&pvmw)) {
if (new_page)
- mem_cgroup_cancel_charge(new_page, memcg, false);
+ mem_cgroup_cancel_charge(new_page, memcg);
goto unlock;
}
VM_BUG_ON_PAGE(addr != pvmw.address, old_page);
@@ -189,7 +189,7 @@ static int __replace_page(struct vm_area_struct *vma, unsigned long addr,
if (new_page) {
get_page(new_page);
page_add_new_anon_rmap(new_page, vma, addr, false);
- mem_cgroup_commit_charge(new_page, memcg, false, false);
+ mem_cgroup_commit_charge(new_page, memcg, false);
lru_cache_add_active_or_unevictable(new_page, vma);
} else
/* no new page, just dec_mm_counter for old_page */