[RFC PATCH 3/3] mm: compaction: Fix the migration stats in trace_mm_compaction_migratepages()
From: Baolin Wang <baolin.wang@linux.alibaba.com>
Date: 2021-11-03 10:51:35
Also in:
lkml
Subsystem:
memory management, memory management - page allocator, the rest, tracing · Maintainers:
Andrew Morton, Vlastimil Babka, Linus Torvalds, Steven Rostedt, Masami Hiramatsu
Now the migrate_pages() has changed to return the number of {normal page,
THP, hugetlb} instead, thus we should not use the return value to calculate
the number of pages migrated successfully. Instead we can just use the
'nr_succeeded' which indicates the number of normal pages migrated successfully
to calculate the non-migrated pages in trace_mm_compaction_migratepages().
Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com>
---
include/trace/events/compaction.h | 24 ++++--------------------
mm/compaction.c | 7 ++++---
2 files changed, 8 insertions(+), 23 deletions(-)
diff --git a/include/trace/events/compaction.h b/include/trace/events/compaction.h
index 54e5bf0..7d48e70 100644
--- a/include/trace/events/compaction.h
+++ b/include/trace/events/compaction.h@@ -68,10 +68,9 @@ TRACE_EVENT(mm_compaction_migratepages, TP_PROTO(unsigned long nr_all, - int migrate_rc, - struct list_head *migratepages), + unsigned int nr_succeeded), - TP_ARGS(nr_all, migrate_rc, migratepages), + TP_ARGS(nr_all, nr_succeeded), TP_STRUCT__entry( __field(unsigned long, nr_migrated)
@@ -79,23 +78,8 @@ ), TP_fast_assign( - unsigned long nr_failed = 0; - struct list_head *page_lru; - - /* - * migrate_pages() returns either a non-negative number - * with the number of pages that failed migration, or an - * error code, in which case we need to count the remaining - * pages manually - */ - if (migrate_rc >= 0) - nr_failed = migrate_rc; - else - list_for_each(page_lru, migratepages) - nr_failed++; - - __entry->nr_migrated = nr_all - nr_failed; - __entry->nr_failed = nr_failed; + __entry->nr_migrated = nr_succeeded; + __entry->nr_failed = nr_all - nr_succeeded; ), TP_printk("nr_migrated=%lu nr_failed=%lu",
diff --git a/mm/compaction.c b/mm/compaction.c
index 6e44609..b4e94cd 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c@@ -2280,6 +2280,7 @@ bool compaction_zonelist_suitable(struct alloc_context *ac, int order, unsigned long last_migrated_pfn; const bool sync = cc->mode != MIGRATE_ASYNC; bool update_cached; + unsigned int nr_succeeded = 0; /* * These counters track activities during zone compaction. Initialize
@@ -2398,10 +2399,10 @@ bool compaction_zonelist_suitable(struct alloc_context *ac, int order, err = migrate_pages(&cc->migratepages, compaction_alloc, compaction_free, (unsigned long)cc, cc->mode, - MR_COMPACTION, NULL); + MR_COMPACTION, &nr_succeeded); - trace_mm_compaction_migratepages(cc->nr_migratepages, err, - &cc->migratepages); + trace_mm_compaction_migratepages(cc->nr_migratepages, + nr_succeeded); /* All pages were either migrated or will be released */ cc->nr_migratepages = 0;
--
1.8.3.1