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authorJohannes Weiner <hannes@cmpxchg.org>2020-06-03 16:01:31 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-06-03 20:09:47 -0700
commit3fba69a56e16e8dcf182fe6ca77735dd65a898aa (patch)
treec992db06268296ead7fa8b36f62b1ebb8505bbf3 /mm/shmem.c
parentabb242f57196dbaa108271575353a0453f6834ef (diff)
downloadlinux-3fba69a56e16e8dcf182fe6ca77735dd65a898aa.tar.bz2
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 'mm/shmem.c')
-rw-r--r--mm/shmem.c22
1 files changed, 9 insertions, 13 deletions
diff --git a/mm/shmem.c b/mm/shmem.c
index bd8840082c94..d505b6cce4ab 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -1664,8 +1664,7 @@ static int shmem_swapin_page(struct inode *inode, pgoff_t index,
goto failed;
}
- error = mem_cgroup_try_charge_delay(page, charge_mm, gfp, &memcg,
- false);
+ error = mem_cgroup_try_charge_delay(page, charge_mm, gfp, &memcg);
if (!error) {
error = shmem_add_to_page_cache(page, mapping, index,
swp_to_radix_entry(swap), gfp);
@@ -1680,14 +1679,14 @@ static int shmem_swapin_page(struct inode *inode, pgoff_t index,
* the rest.
*/
if (error) {
- mem_cgroup_cancel_charge(page, memcg, false);
+ mem_cgroup_cancel_charge(page, memcg);
delete_from_swap_cache(page);
}
}
if (error)
goto failed;
- mem_cgroup_commit_charge(page, memcg, true, false);
+ mem_cgroup_commit_charge(page, memcg, true);
spin_lock_irq(&info->lock);
info->swapped--;
@@ -1859,8 +1858,7 @@ alloc_nohuge:
if (sgp == SGP_WRITE)
__SetPageReferenced(page);
- error = mem_cgroup_try_charge_delay(page, charge_mm, gfp, &memcg,
- PageTransHuge(page));
+ error = mem_cgroup_try_charge_delay(page, charge_mm, gfp, &memcg);
if (error) {
if (PageTransHuge(page)) {
count_vm_event(THP_FILE_FALLBACK);
@@ -1871,12 +1869,10 @@ alloc_nohuge:
error = shmem_add_to_page_cache(page, mapping, hindex,
NULL, gfp & GFP_RECLAIM_MASK);
if (error) {
- mem_cgroup_cancel_charge(page, memcg,
- PageTransHuge(page));
+ mem_cgroup_cancel_charge(page, memcg);
goto unacct;
}
- mem_cgroup_commit_charge(page, memcg, false,
- PageTransHuge(page));
+ mem_cgroup_commit_charge(page, memcg, false);
lru_cache_add_anon(page);
spin_lock_irq(&info->lock);
@@ -2364,7 +2360,7 @@ static int shmem_mfill_atomic_pte(struct mm_struct *dst_mm,
if (unlikely(offset >= max_off))
goto out_release;
- ret = mem_cgroup_try_charge_delay(page, dst_mm, gfp, &memcg, false);
+ ret = mem_cgroup_try_charge_delay(page, dst_mm, gfp, &memcg);
if (ret)
goto out_release;
@@ -2373,7 +2369,7 @@ static int shmem_mfill_atomic_pte(struct mm_struct *dst_mm,
if (ret)
goto out_release_uncharge;
- mem_cgroup_commit_charge(page, memcg, false, false);
+ mem_cgroup_commit_charge(page, memcg, false);
_dst_pte = mk_pte(page, dst_vma->vm_page_prot);
if (dst_vma->vm_flags & VM_WRITE)
@@ -2424,7 +2420,7 @@ out_release_uncharge_unlock:
ClearPageDirty(page);
delete_from_page_cache(page);
out_release_uncharge:
- mem_cgroup_cancel_charge(page, memcg, false);
+ mem_cgroup_cancel_charge(page, memcg);
out_release:
unlock_page(page);
put_page(page);