From 0ba5e806e14e97a4dd34e21ae2994693bcdd0406 Mon Sep 17 00:00:00 2001 From: Illia Ostapyshyn Date: Fri, 17 May 2024 11:13:48 +0200 Subject: mm/vmscan: update stale references to shrink_page_list Commit 49fd9b6df54e ("mm/vmscan: fix a lot of comments") renamed shrink_page_list() to shrink_folio_list(). Fix up the remaining references to the old name in comments and documentation. Link: https://lkml.kernel.org/r/20240517091348.1185566-1-illia@yshyn.com Signed-off-by: Illia Ostapyshyn Cc: Jonathan Corbet Cc: Matthew Wilcox (Oracle) Signed-off-by: Andrew Morton --- mm/truncate.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'mm/truncate.c') diff --git a/mm/truncate.c b/mm/truncate.c index e99085bf3d34..5ce62a939e55 100644 --- a/mm/truncate.c +++ b/mm/truncate.c @@ -554,7 +554,7 @@ EXPORT_SYMBOL(invalidate_mapping_pages); * This is like mapping_evict_folio(), except it ignores the folio's * refcount. We do this because invalidate_inode_pages2() needs stronger * invalidation guarantees, and cannot afford to leave folios behind because - * shrink_page_list() has a temp ref on them, or because they're transiently + * shrink_folio_list() has a temp ref on them, or because they're transiently * sitting in the folio_add_lru() caches. */ static int invalidate_complete_folio2(struct address_space *mapping, -- cgit v1.2.3 From 61c663e020d263eaecc7f09afa40f7bbe160931e Mon Sep 17 00:00:00 2001 From: Yu Zhao Date: Mon, 8 Jul 2024 15:27:53 -0600 Subject: mm/truncate: batch-clear shadow entries Make clear_shadow_entry() clear shadow entries in `struct folio_batch` so that it can reduce contention on i_lock and i_pages locks, e.g., watchdog: BUG: soft lockup - CPU#29 stuck for 11s! [fio:2701649] clear_shadow_entry+0x3d/0x100 mapping_try_invalidate+0x117/0x1d0 invalidate_mapping_pages+0x10/0x20 invalidate_bdev+0x3c/0x50 blkdev_common_ioctl+0x5f7/0xa90 blkdev_ioctl+0x109/0x270 Also, rename clear_shadow_entry() to clear_shadow_entries() accordingly. [yuzhao@google.com: v2] Link: https://lkml.kernel.org/r/20240710060933.3979380-1-yuzhao@google.com Link: https://lkml.kernel.org/r/20240708212753.3120511-1-yuzhao@google.com Reported-by: Bharata B Rao Closes: https://lore.kernel.org/d2841226-e27b-4d3d-a578-63587a3aa4f3@amd.com/ Signed-off-by: Yu Zhao Cc: Mel Gorman Cc: Johannes Weiner Signed-off-by: Andrew Morton --- mm/truncate.c | 68 +++++++++++++++++++++++++++-------------------------------- 1 file changed, 31 insertions(+), 37 deletions(-) (limited to 'mm/truncate.c') diff --git a/mm/truncate.c b/mm/truncate.c index 5ce62a939e55..dfb3d1f4d456 100644 --- a/mm/truncate.c +++ b/mm/truncate.c @@ -39,12 +39,25 @@ static inline void __clear_shadow_entry(struct address_space *mapping, xas_store(&xas, NULL); } -static void clear_shadow_entry(struct address_space *mapping, pgoff_t index, - void *entry) +static void clear_shadow_entries(struct address_space *mapping, + struct folio_batch *fbatch, pgoff_t *indices) { + int i; + + /* Handled by shmem itself, or for DAX we do nothing. */ + if (shmem_mapping(mapping) || dax_mapping(mapping)) + return; + spin_lock(&mapping->host->i_lock); xa_lock_irq(&mapping->i_pages); - __clear_shadow_entry(mapping, index, entry); + + for (i = 0; i < folio_batch_count(fbatch); i++) { + struct folio *folio = fbatch->folios[i]; + + if (xa_is_value(folio)) + __clear_shadow_entry(mapping, indices[i], folio); + } + xa_unlock_irq(&mapping->i_pages); if (mapping_shrinkable(mapping)) inode_add_lru(mapping->host); @@ -105,36 +118,6 @@ static void truncate_folio_batch_exceptionals(struct address_space *mapping, fbatch->nr = j; } -/* - * Invalidate exceptional entry if easily possible. This handles exceptional - * entries for invalidate_inode_pages(). - */ -static int invalidate_exceptional_entry(struct address_space *mapping, - pgoff_t index, void *entry) -{ - /* Handled by shmem itself, or for DAX we do nothing. */ - if (shmem_mapping(mapping) || dax_mapping(mapping)) - return 1; - clear_shadow_entry(mapping, index, entry); - return 1; -} - -/* - * Invalidate exceptional entry if clean. This handles exceptional entries for - * invalidate_inode_pages2() so for DAX it evicts only clean entries. - */ -static int invalidate_exceptional_entry2(struct address_space *mapping, - pgoff_t index, void *entry) -{ - /* Handled by shmem itself */ - if (shmem_mapping(mapping)) - return 1; - if (dax_mapping(mapping)) - return dax_invalidate_mapping_entry_sync(mapping, index); - clear_shadow_entry(mapping, index, entry); - return 1; -} - /** * folio_invalidate - Invalidate part or all of a folio. * @folio: The folio which is affected. @@ -494,6 +477,7 @@ unsigned long mapping_try_invalidate(struct address_space *mapping, unsigned long ret; unsigned long count = 0; int i; + bool xa_has_values = false; folio_batch_init(&fbatch); while (find_lock_entries(mapping, &index, end, &fbatch, indices)) { @@ -503,8 +487,8 @@ unsigned long mapping_try_invalidate(struct address_space *mapping, /* We rely upon deletion not changing folio->index */ if (xa_is_value(folio)) { - count += invalidate_exceptional_entry(mapping, - indices[i], folio); + xa_has_values = true; + count++; continue; } @@ -522,6 +506,10 @@ unsigned long mapping_try_invalidate(struct address_space *mapping, } count += ret; } + + if (xa_has_values) + clear_shadow_entries(mapping, &fbatch, indices); + folio_batch_remove_exceptionals(&fbatch); folio_batch_release(&fbatch); cond_resched(); @@ -616,6 +604,7 @@ int invalidate_inode_pages2_range(struct address_space *mapping, int ret = 0; int ret2 = 0; int did_range_unmap = 0; + bool xa_has_values = false; if (mapping_empty(mapping)) return 0; @@ -629,8 +618,9 @@ int invalidate_inode_pages2_range(struct address_space *mapping, /* We rely upon deletion not changing folio->index */ if (xa_is_value(folio)) { - if (!invalidate_exceptional_entry2(mapping, - indices[i], folio)) + xa_has_values = true; + if (dax_mapping(mapping) && + !dax_invalidate_mapping_entry_sync(mapping, indices[i])) ret = -EBUSY; continue; } @@ -666,6 +656,10 @@ int invalidate_inode_pages2_range(struct address_space *mapping, ret = ret2; folio_unlock(folio); } + + if (xa_has_values) + clear_shadow_entries(mapping, &fbatch, indices); + folio_batch_remove_exceptionals(&fbatch); folio_batch_release(&fbatch); cond_resched(); -- cgit v1.2.3