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Message-ID: <20240614221525.19170-2-shivankg@amd.com>
Date: Sat, 15 Jun 2024 03:45:21 +0530
From: Shivank Garg <shivankg@....com>
To: <akpm@...ux-foundation.org>, <linux-kernel@...r.kernel.org>,
<linux-mm@...ck.org>
CC: <bharata@....com>, <raghavendra.kodsarathimmappa@....com>,
<Michael.Day@....com>, <dmaengine@...r.kernel.org>, <vkoul@...nel.org>,
<shivankg@....com>, Byungchul Park <byungchul@...com>
Subject: [RFC PATCH 1/5] mm: separate move/undo doing on folio list from migrate_pages_batch()
From: Byungchul Park <byungchul@...com>
Functionally, no change. This is a preparatory patch picked from luf
(lazy unmap flush) patch series. This patch improve code organization
and readability for steps involving migrate_folio_move().
Refactored migrate_pages_batch() and separated move and undo parts
operating on folio list, from migrate_pages_batch().
Signed-off-by: Byungchul Park <byungchul@...com>
Signed-off-by: Shivank Garg <shivankg@....com>
---
mm/migrate.c | 134 +++++++++++++++++++++++++++++++--------------------
1 file changed, 83 insertions(+), 51 deletions(-)
diff --git a/mm/migrate.c b/mm/migrate.c
index c27b1f8097d4..6c36c6e0a360 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1606,6 +1606,81 @@ static int migrate_hugetlbs(struct list_head *from, new_folio_t get_new_folio,
return nr_failed;
}
+static void migrate_folios_move(struct list_head *src_folios,
+ struct list_head *dst_folios,
+ free_folio_t put_new_folio, unsigned long private,
+ enum migrate_mode mode, int reason,
+ struct list_head *ret_folios,
+ struct migrate_pages_stats *stats,
+ int *retry, int *thp_retry, int *nr_failed,
+ int *nr_retry_pages)
+{
+ struct folio *folio, *folio2, *dst, *dst2;
+ bool is_thp;
+ int nr_pages;
+ int rc;
+
+ dst = list_first_entry(dst_folios, struct folio, lru);
+ dst2 = list_next_entry(dst, lru);
+ list_for_each_entry_safe(folio, folio2, src_folios, lru) {
+ is_thp = folio_test_large(folio) && folio_test_pmd_mappable(folio);
+ nr_pages = folio_nr_pages(folio);
+
+ cond_resched();
+
+ rc = migrate_folio_move(put_new_folio, private,
+ folio, dst, mode,
+ reason, ret_folios);
+ /*
+ * The rules are:
+ * Success: folio will be freed
+ * -EAGAIN: stay on the unmap_folios list
+ * Other errno: put on ret_folios list
+ */
+ switch (rc) {
+ case -EAGAIN:
+ *retry += 1;
+ *thp_retry += is_thp;
+ *nr_retry_pages += nr_pages;
+ break;
+ case MIGRATEPAGE_SUCCESS:
+ stats->nr_succeeded += nr_pages;
+ stats->nr_thp_succeeded += is_thp;
+ break;
+ default:
+ *nr_failed += 1;
+ stats->nr_thp_failed += is_thp;
+ stats->nr_failed_pages += nr_pages;
+ break;
+ }
+ dst = dst2;
+ dst2 = list_next_entry(dst, lru);
+ }
+}
+
+static void migrate_folios_undo(struct list_head *src_folios,
+ struct list_head *dst_folios,
+ free_folio_t put_new_folio, unsigned long private,
+ struct list_head *ret_folios)
+{
+ struct folio *folio, *folio2, *dst, *dst2;
+
+ dst = list_first_entry(dst_folios, struct folio, lru);
+ dst2 = list_next_entry(dst, lru);
+ list_for_each_entry_safe(folio, folio2, src_folios, lru) {
+ int old_page_state = 0;
+ struct anon_vma *anon_vma = NULL;
+
+ __migrate_folio_extract(dst, &old_page_state, &anon_vma);
+ migrate_folio_undo_src(folio, old_page_state & PAGE_WAS_MAPPED,
+ anon_vma, true, ret_folios);
+ list_del(&dst->lru);
+ migrate_folio_undo_dst(dst, true, put_new_folio, private);
+ dst = dst2;
+ dst2 = list_next_entry(dst, lru);
+ }
+}
+
/*
* migrate_pages_batch() first unmaps folios in the from list as many as
* possible, then move the unmapped folios.
@@ -1628,7 +1703,7 @@ static int migrate_pages_batch(struct list_head *from,
int pass = 0;
bool is_thp = false;
bool is_large = false;
- struct folio *folio, *folio2, *dst = NULL, *dst2;
+ struct folio *folio, *folio2, *dst = NULL;
int rc, rc_saved = 0, nr_pages;
LIST_HEAD(unmap_folios);
LIST_HEAD(dst_folios);
@@ -1764,42 +1839,11 @@ static int migrate_pages_batch(struct list_head *from,
thp_retry = 0;
nr_retry_pages = 0;
- dst = list_first_entry(&dst_folios, struct folio, lru);
- dst2 = list_next_entry(dst, lru);
- list_for_each_entry_safe(folio, folio2, &unmap_folios, lru) {
- is_thp = folio_test_large(folio) && folio_test_pmd_mappable(folio);
- nr_pages = folio_nr_pages(folio);
-
- cond_resched();
-
- rc = migrate_folio_move(put_new_folio, private,
- folio, dst, mode,
- reason, ret_folios);
- /*
- * The rules are:
- * Success: folio will be freed
- * -EAGAIN: stay on the unmap_folios list
- * Other errno: put on ret_folios list
- */
- switch(rc) {
- case -EAGAIN:
- retry++;
- thp_retry += is_thp;
- nr_retry_pages += nr_pages;
- break;
- case MIGRATEPAGE_SUCCESS:
- stats->nr_succeeded += nr_pages;
- stats->nr_thp_succeeded += is_thp;
- break;
- default:
- nr_failed++;
- stats->nr_thp_failed += is_thp;
- stats->nr_failed_pages += nr_pages;
- break;
- }
- dst = dst2;
- dst2 = list_next_entry(dst, lru);
- }
+ /* Move the unmapped folios */
+ migrate_folios_move(&unmap_folios, &dst_folios,
+ put_new_folio, private, mode, reason,
+ ret_folios, stats, &retry, &thp_retry,
+ &nr_failed, &nr_retry_pages);
}
nr_failed += retry;
stats->nr_thp_failed += thp_retry;
@@ -1808,20 +1852,8 @@ static int migrate_pages_batch(struct list_head *from,
rc = rc_saved ? : nr_failed;
out:
/* Cleanup remaining folios */
- dst = list_first_entry(&dst_folios, struct folio, lru);
- dst2 = list_next_entry(dst, lru);
- list_for_each_entry_safe(folio, folio2, &unmap_folios, lru) {
- int old_page_state = 0;
- struct anon_vma *anon_vma = NULL;
-
- __migrate_folio_extract(dst, &old_page_state, &anon_vma);
- migrate_folio_undo_src(folio, old_page_state & PAGE_WAS_MAPPED,
- anon_vma, true, ret_folios);
- list_del(&dst->lru);
- migrate_folio_undo_dst(dst, true, put_new_folio, private);
- dst = dst2;
- dst2 = list_next_entry(dst, lru);
- }
+ migrate_folios_undo(&unmap_folios, &dst_folios,
+ put_new_folio, private, ret_folios);
return rc;
}
--
2.34.1
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