From: Mina Almasry <almasrymina@google.com>
To: mike.kravetz@oracle.com
Cc: shuah@kernel.org, almasrymina@google.com, rientjes@google.com,
shakeelb@google.com, gthelen@google.com,
akpm@linux-foundation.org, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, linux-kselftest@vger.kernel.org,
cgroups@vger.kernel.org
Subject: [PATCH v11 6/9] hugetlb_cgroup: support noreserve mappings
Date: Mon, 3 Feb 2020 15:22:45 -0800 [thread overview]
Message-ID: <20200203232248.104733-6-almasrymina@google.com> (raw)
In-Reply-To: <20200203232248.104733-1-almasrymina@google.com>
Support MAP_NORESERVE accounting as part of the new counter.
For each hugepage allocation, at allocation time we check if there is
a reservation for this allocation or not. If there is a reservation for
this allocation, then this allocation was charged at reservation time,
and we don't re-account it. If there is no reserevation for this
allocation, we charge the appropriate hugetlb_cgroup.
The hugetlb_cgroup to uncharge for this allocation is stored in
page[3].private. We use new APIs added in an earlier patch to set this
pointer.
Signed-off-by: Mina Almasry <almasrymina@google.com>
---
Changes in v10:
- Refactored deferred_reserve check.
---
mm/hugetlb.c | 28 +++++++++++++++++++++++++++-
1 file changed, 27 insertions(+), 1 deletion(-)
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 33818ccaf7e89..ec0b55ea1506e 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -1339,6 +1339,9 @@ static void __free_huge_page(struct page *page)
clear_page_huge_active(page);
hugetlb_cgroup_uncharge_page(hstate_index(h), pages_per_huge_page(h),
page, false);
+ hugetlb_cgroup_uncharge_page(hstate_index(h), pages_per_huge_page(h),
+ page, true);
+
if (restore_reserve)
h->resv_huge_pages++;
@@ -2172,6 +2175,7 @@ struct page *alloc_huge_page(struct vm_area_struct *vma,
long gbl_chg;
int ret, idx;
struct hugetlb_cgroup *h_cg;
+ bool deferred_reserve;
idx = hstate_index(h);
/*
@@ -2209,10 +2213,20 @@ struct page *alloc_huge_page(struct vm_area_struct *vma,
gbl_chg = 1;
}
+ /* If this allocation is not consuming a reservation, charge it now.
+ */
+ deferred_reserve = map_chg || avoid_reserve || !vma_resv_map(vma);
+ if (deferred_reserve) {
+ ret = hugetlb_cgroup_charge_cgroup(idx, pages_per_huge_page(h),
+ &h_cg, true);
+ if (ret)
+ goto out_subpool_put;
+ }
+
ret = hugetlb_cgroup_charge_cgroup(idx, pages_per_huge_page(h), &h_cg,
false);
if (ret)
- goto out_subpool_put;
+ goto out_uncharge_cgroup_reservation;
spin_lock(&hugetlb_lock);
/*
@@ -2236,6 +2250,14 @@ struct page *alloc_huge_page(struct vm_area_struct *vma,
}
hugetlb_cgroup_commit_charge(idx, pages_per_huge_page(h), h_cg, page,
false);
+ /* If allocation is not consuming a reservation, also store the
+ * hugetlb_cgroup pointer on the page.
+ */
+ if (deferred_reserve) {
+ hugetlb_cgroup_commit_charge(idx, pages_per_huge_page(h), h_cg,
+ page, true);
+ }
+
spin_unlock(&hugetlb_lock);
set_page_private(page, (unsigned long)spool);
@@ -2261,6 +2283,10 @@ struct page *alloc_huge_page(struct vm_area_struct *vma,
out_uncharge_cgroup:
hugetlb_cgroup_uncharge_cgroup(idx, pages_per_huge_page(h), h_cg,
false);
+out_uncharge_cgroup_reservation:
+ if (deferred_reserve)
+ hugetlb_cgroup_uncharge_cgroup(idx, pages_per_huge_page(h),
+ h_cg, true);
out_subpool_put:
if (map_chg || avoid_reserve)
hugepage_subpool_put_pages(spool, 1);
--
2.25.0.341.g760bfbb309-goog
next prev parent reply other threads:[~2020-02-03 23:23 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-03 23:22 [PATCH v11 1/9] hugetlb_cgroup: Add hugetlb_cgroup reservation counter Mina Almasry
2020-02-03 23:22 ` [PATCH v11 2/9] hugetlb_cgroup: add interface for charge/uncharge hugetlb reservations Mina Almasry
2020-02-05 22:08 ` Mike Kravetz
2020-02-06 18:16 ` Mina Almasry
2020-02-03 23:22 ` [PATCH v11 3/9] hugetlb_cgroup: add reservation accounting for private mappings Mina Almasry
2020-02-05 23:26 ` Mike Kravetz
2020-02-03 23:22 ` [PATCH v11 4/9] hugetlb: disable region_add file_region coalescing Mina Almasry
2020-02-05 23:57 ` Mike Kravetz
2020-02-06 1:43 ` Mina Almasry
2020-02-06 2:12 ` Mike Kravetz
2020-02-03 23:22 ` [PATCH v11 5/9] hugetlb_cgroup: add accounting for shared mappings Mina Almasry
2020-02-06 19:33 ` Mike Kravetz
2020-02-06 20:09 ` Mina Almasry
2020-02-03 23:22 ` Mina Almasry [this message]
2020-02-06 22:31 ` [PATCH v11 6/9] hugetlb_cgroup: support noreserve mappings Mike Kravetz
2020-02-07 18:16 ` Mike Kravetz
2020-02-11 21:35 ` Mina Almasry
2020-02-11 21:51 ` Mike Kravetz
2020-02-03 23:22 ` [PATCH v11 7/9] hugetlb: support file_region coalescing again Mina Almasry
2020-02-07 0:17 ` Mike Kravetz
2020-02-07 18:44 ` Mina Almasry
2020-02-03 23:22 ` [PATCH v11 8/9] hugetlb_cgroup: Add hugetlb_cgroup reservation tests Mina Almasry
2020-02-04 16:26 ` Sandipan Das
2020-02-04 20:36 ` Mina Almasry
2020-02-04 22:33 ` Mina Almasry
2020-02-05 12:42 ` Sandipan Das
2020-02-05 18:03 ` Mina Almasry
2020-02-03 23:22 ` [PATCH v11 9/9] hugetlb_cgroup: Add hugetlb_cgroup reservation docs Mina Almasry
2020-02-05 19:36 ` [PATCH v11 1/9] hugetlb_cgroup: Add hugetlb_cgroup reservation counter Mike Kravetz
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