From: Hugh Dickins <hughd@google.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Andi Kleen <ak@linux.intel.com>, Christoph Lameter <cl@linux.com>,
Matthew Wilcox <willy@infradead.org>,
Mike Kravetz <mike.kravetz@oracle.com>,
David Hildenbrand <david@redhat.com>,
Suren Baghdasaryan <surenb@google.com>,
Yang Shi <shy828301@gmail.com>,
Sidhartha Kumar <sidhartha.kumar@oracle.com>,
Vishal Moola <vishal.moola@gmail.com>,
Kefeng Wang <wangkefeng.wang@huawei.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Tejun Heo <tj@kernel.org>,
Mel Gorman <mgorman@techsingularity.net>,
Michal Hocko <mhocko@suse.com>,
"Huang, Ying" <ying.huang@intel.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: [PATCH v2 07/12] mempolicy: mpol_shared_policy_init() without pseudo-vma
Date: Tue, 3 Oct 2023 02:22:59 -0700 (PDT) [thread overview]
Message-ID: <3bef62d8-ae78-4c2-533-56a44ae425c@google.com> (raw)
In-Reply-To: <ebc0987e-beff-8bfb-9283-234c2cbd17c5@google.com>
mpol_shared_policy_init() does not need to use a pseudo-vma: it can use
sp_alloc() and sp_insert() directly, since the object's shared policy
tree is empty and inaccessible (needing no lock) at get_inode() time.
Signed-off-by: Hugh Dickins <hughd@google.com>
---
mm/mempolicy.c | 28 ++++++++++++++--------------
1 file changed, 14 insertions(+), 14 deletions(-)
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 1d3f9e1ecbb8..5d99fd5cd60b 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -2756,30 +2756,30 @@ void mpol_shared_policy_init(struct shared_policy *sp, struct mempolicy *mpol)
rwlock_init(&sp->lock);
if (mpol) {
- struct vm_area_struct pvma;
- struct mempolicy *new;
+ struct sp_node *sn;
+ struct mempolicy *npol;
NODEMASK_SCRATCH(scratch);
if (!scratch)
goto put_mpol;
- /* contextualize the tmpfs mount point mempolicy */
- new = mpol_new(mpol->mode, mpol->flags, &mpol->w.user_nodemask);
- if (IS_ERR(new))
+
+ /* contextualize the tmpfs mount point mempolicy to this file */
+ npol = mpol_new(mpol->mode, mpol->flags, &mpol->w.user_nodemask);
+ if (IS_ERR(npol))
goto free_scratch; /* no valid nodemask intersection */
task_lock(current);
- ret = mpol_set_nodemask(new, &mpol->w.user_nodemask, scratch);
+ ret = mpol_set_nodemask(npol, &mpol->w.user_nodemask, scratch);
task_unlock(current);
if (ret)
- goto put_new;
+ goto put_npol;
- /* Create pseudo-vma that contains just the policy */
- vma_init(&pvma, NULL);
- pvma.vm_end = TASK_SIZE; /* policy covers entire file */
- mpol_set_shared_policy(sp, &pvma, new); /* adds ref */
-
-put_new:
- mpol_put(new); /* drop initial ref */
+ /* alloc node covering entire file; adds ref to file's npol */
+ sn = sp_alloc(0, MAX_LFS_FILESIZE >> PAGE_SHIFT, npol);
+ if (sn)
+ sp_insert(sp, sn);
+put_npol:
+ mpol_put(npol); /* drop initial ref on file's npol */
free_scratch:
NODEMASK_SCRATCH_FREE(scratch);
put_mpol:
--
2.35.3
next prev parent reply other threads:[~2023-10-03 9:23 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-03 9:12 [PATCH v2 00/12] mempolicy: cleanups leading to NUMA mpol without vma Hugh Dickins
2023-10-03 9:15 ` [PATCH v2 01/12] hugetlbfs: drop shared NUMA mempolicy pretence Hugh Dickins
2023-10-03 9:16 ` [PATCH v2 02/12] kernfs: drop shared NUMA mempolicy hooks Hugh Dickins
2023-10-03 9:17 ` [PATCH v2 03/12] mempolicy: fix migrate_pages(2) syscall return nr_failed Hugh Dickins
2023-10-07 7:27 ` Huang, Ying
2023-10-03 9:19 ` [PATCH v2 04/12] mempolicy trivia: delete those ancient pr_debug()s Hugh Dickins
2023-10-03 9:20 ` [PATCH v2 05/12] mempolicy trivia: slightly more consistent naming Hugh Dickins
2023-10-03 9:21 ` [PATCH v2 06/12] mempolicy trivia: use pgoff_t in shared mempolicy tree Hugh Dickins
2023-10-03 9:22 ` Hugh Dickins [this message]
2023-10-03 9:24 ` [PATCH v2 08/12] mempolicy: remove confusing MPOL_MF_LAZY dead code Hugh Dickins
2023-10-03 22:28 ` Yang Shi
2023-10-03 9:25 ` [PATCH v2 09/12] mm: add page_rmappable_folio() wrapper Hugh Dickins
2023-10-03 9:26 ` [PATCH v2 10/12] mempolicy: alloc_pages_mpol() for NUMA policy without vma Hugh Dickins
2023-10-19 20:39 ` [PATCH v3 " Hugh Dickins
2023-10-23 16:53 ` domenico cerasuolo
2023-10-23 17:53 ` Andrew Morton
2023-10-23 18:10 ` domenico cerasuolo
2023-10-23 19:05 ` Johannes Weiner
2023-10-23 19:48 ` Hugh Dickins
2023-10-24 6:44 ` [PATCH] mempolicy: alloc_pages_mpol() for NUMA policy without vma: fix Hugh Dickins
2023-10-24 8:17 ` kernel test robot
2023-10-24 15:56 ` Hugh Dickins
2023-10-24 16:09 ` [PATCH v2] " Hugh Dickins
2023-10-23 18:34 ` [PATCH v3 10/12] mempolicy: alloc_pages_mpol() for NUMA policy without vma Zi Yan
2023-10-23 21:10 ` Hugh Dickins
2023-10-23 21:13 ` Zi Yan
2023-10-03 9:27 ` [PATCH v2 11/12] mempolicy: mmap_lock is not needed while migrating folios Hugh Dickins
2023-10-03 9:29 ` [PATCH v2 12/12] mempolicy: migration attempt to match interleave nodes Hugh Dickins
2023-10-24 6:50 ` [PATCH] mempolicy: migration attempt to match interleave nodes: fix Hugh Dickins
2023-10-24 15:18 ` Liam R. Howlett
2023-10-24 16:32 ` Hugh Dickins
2023-10-24 16:45 ` Matthew Wilcox
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