145 lines
7.1 KiB
Diff
145 lines
7.1 KiB
Diff
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Date: Sat, 13 Mar 2021 00:57:40 -0700
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In-Reply-To: <20210313075747.3781593-1-yuzhao@google.com>
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Message-Id: <20210313075747.3781593-8-yuzhao@google.com>
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Subject: [PATCH v1 07/14] mm/pagewalk.c: add pud_entry_post() for post-order traversals
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From: Yu Zhao <yuzhao@google.com>
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To: linux-mm@kvack.org
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Cc: Alex Shi <alex.shi@linux.alibaba.com>,
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Andrew Morton <akpm@linux-foundation.org>,
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Dave Hansen <dave.hansen@linux.intel.com>,
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Hillf Danton <hdanton@sina.com>,
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Johannes Weiner <hannes@cmpxchg.org>,
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Joonsoo Kim <iamjoonsoo.kim@lge.com>,
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Matthew Wilcox <willy@infradead.org>,
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Mel Gorman <mgorman@suse.de>, Michal Hocko <mhocko@suse.com>,
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Roman Gushchin <guro@fb.com>, Vlastimil Babka <vbabka@suse.cz>,
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Wei Yang <richard.weiyang@linux.alibaba.com>,
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Yang Shi <shy828301@gmail.com>,
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Ying Huang <ying.huang@intel.com>,
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linux-kernel@vger.kernel.org, page-reclaim@google.com,
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Yu Zhao <yuzhao@google.com>
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Precedence: bulk
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Archived-At: <https://lore.kernel.org/lkml/20210313075747.3781593-8-yuzhao@google.com/>
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List-Post: <mailto:linux-kernel@vger.kernel.org>
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Add a new callback pud_entry_post() to struct mm_walk_ops so that page
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table walkers can visit the non-leaf PMD entries of a PUD entry after
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they have visited with the leaf PTE entries. This allows page table
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walkers who clear the accessed bit to take advantage of the last
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commit, in a similar way walk_pte_range() works for the PTE entries of
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a PMD entry: they only need to take PTL once to search all the child
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entries of a parent entry.
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Signed-off-by: Yu Zhao <yuzhao@google.com>
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---
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include/linux/pagewalk.h | 4 ++++
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mm/pagewalk.c | 5 +++++
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2 files changed, 9 insertions(+)
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diff --git a/include/linux/pagewalk.h b/include/linux/pagewalk.h
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index b1cb6b753abb..2b68ae9d27d3 100644
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--- a/include/linux/pagewalk.h
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+++ b/include/linux/pagewalk.h
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@@ -11,6 +11,8 @@ struct mm_walk;
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* @pgd_entry: if set, called for each non-empty PGD (top-level) entry
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* @p4d_entry: if set, called for each non-empty P4D entry
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* @pud_entry: if set, called for each non-empty PUD entry
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+ * @pud_entry_post: if set, called for each non-empty PUD entry after
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+ * pmd_entry is called, for post-order traversal.
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* @pmd_entry: if set, called for each non-empty PMD entry
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* this handler is required to be able to handle
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* pmd_trans_huge() pmds. They may simply choose to
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@@ -41,6 +43,8 @@ struct mm_walk_ops {
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unsigned long next, struct mm_walk *walk);
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int (*pud_entry)(pud_t *pud, unsigned long addr,
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unsigned long next, struct mm_walk *walk);
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+ int (*pud_entry_post)(pud_t *pud, unsigned long addr,
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+ unsigned long next, struct mm_walk *walk);
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int (*pmd_entry)(pmd_t *pmd, unsigned long addr,
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unsigned long next, struct mm_walk *walk);
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int (*pte_entry)(pte_t *pte, unsigned long addr,
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diff --git a/mm/pagewalk.c b/mm/pagewalk.c
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index e81640d9f177..8ed1533f7eda 100644
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--- a/mm/pagewalk.c
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+++ b/mm/pagewalk.c
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@@ -160,6 +160,11 @@ static int walk_pud_range(p4d_t *p4d, unsigned long addr, unsigned long end,
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err = walk_pmd_range(pud, addr, next, walk);
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if (err)
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break;
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+
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+ if (ops->pud_entry_post)
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+ err = ops->pud_entry_post(pud, addr, next, walk);
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+ if (err)
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+ break;
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} while (pud++, addr = next, addr != end);
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return err;
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--
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2.31.0.rc2.261.g7f71774620-goog
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