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| author | Hugh Dickins <hughd@google.com> | 2023-10-03 02:22:59 -0700 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-10-25 16:47:15 -0700 |
| commit | 35ec8fa0207b3c7f7c3c22337c9a507d7b291626 (patch) | |
| tree | f7db72914cab411d4bdd390424110922642c8532 /mm | |
| parent | 93397c3b7684555b7cec726cd13eef6742d191fe (diff) | |
| download | lwn-35ec8fa0207b3c7f7c3c22337c9a507d7b291626.tar.gz lwn-35ec8fa0207b3c7f7c3c22337c9a507d7b291626.zip | |
mempolicy: mpol_shared_policy_init() without pseudo-vma
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.
Link: https://lkml.kernel.org/r/3bef62d8-ae78-4c2-533-56a44ae425c@google.com
Signed-off-by: Hugh Dickins <hughd@google.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "Huang, Ying" <ying.huang@intel.com>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Nhat Pham <nphamcs@gmail.com>
Cc: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Tejun heo <tj@kernel.org>
Cc: Vishal Moola (Oracle) <vishal.moola@gmail.com>
Cc: Yang Shi <shy828301@gmail.com>
Cc: Yosry Ahmed <yosryahmed@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/mempolicy.c | 30 |
1 files changed, 15 insertions, 15 deletions
diff --git a/mm/mempolicy.c b/mm/mempolicy.c index c18f0a1b97e3..b6461d7d200e 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -2736,30 +2736,30 @@ 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; - - /* 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 */ + goto put_npol; + + /* 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: |