The patch titled
Subject: mm, memory hotplug: print debug message in the proper way for online_pages
has been added to the -mm tree. Its filename is
mm-memory-hotplug-print-debug-message-in-the-proper-way-for-online_pages.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-memory-hotplug-print-debug-message-in-the-proper-way-for-online_pages.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-memory-hotplug-print-debug-message-in-the-proper-way-for-online_pages.patch
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------------------------------------------------------
From: Chen Yucong <slaoub@xxxxxxxxx>
Subject: mm, memory hotplug: print debug message in the proper way for online_pages
online_pages() simply returns an error value if
memory_notify(MEM_GOING_ONLINE, &arg) return a value that is not what we
want for successfully onlining target pages. This patch arms to print
more failure information like offline_pages() in online_pages.
This patch also converts printk(KERN_<LEVEL>) to pr_<level>(), and moves
__offline_pages() to not print failure information with KERN_INFO
according to David Rientjes's suggestion[1].
[1] https://lkml.org/lkml/2016/2/24/1094
Signed-off-by: Chen Yucong <slaoub@xxxxxxxxx>
Acked-by: David Rientjes <rientjes@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memory_hotplug.c | 32 ++++++++++++++++----------------
1 file changed, 16 insertions(+), 16 deletions(-)
diff -puN mm/memory_hotplug.c~mm-memory-hotplug-print-debug-message-in-the-proper-way-for-online_pages mm/memory_hotplug.c
--- a/mm/memory_hotplug.c~mm-memory-hotplug-print-debug-message-in-the-proper-way-for-online_pages
+++ a/mm/memory_hotplug.c
@@ -1059,10 +1059,9 @@ int __ref online_pages(unsigned long pfn
ret = memory_notify(MEM_GOING_ONLINE, &arg);
ret = notifier_to_errno(ret);
- if (ret) {
- memory_notify(MEM_CANCEL_ONLINE, &arg);
- return ret;
- }
+ if (ret)
+ goto failed_addition;
+
/*
* If this zone is not populated, then it is not in zonelist.
* This means the page allocator ignores this zone.
@@ -1080,12 +1079,7 @@ int __ref online_pages(unsigned long pfn
if (need_zonelists_rebuild)
zone_pcp_reset(zone);
mutex_unlock(&zonelists_mutex);
- printk(KERN_DEBUG "online_pages [mem %#010llx-%#010llx] failed\n",
- (unsigned long long) pfn << PAGE_SHIFT,
- (((unsigned long long) pfn + nr_pages)
- << PAGE_SHIFT) - 1);
- memory_notify(MEM_CANCEL_ONLINE, &arg);
- return ret;
+ goto failed_addition;
}
zone->present_pages += onlined_pages;
@@ -1118,6 +1112,13 @@ int __ref online_pages(unsigned long pfn
if (onlined_pages)
memory_notify(MEM_ONLINE, &arg);
return 0;
+
+failed_addition:
+ pr_debug("online_pages [mem %#010llx-%#010llx] failed\n",
+ (unsigned long long) pfn << PAGE_SHIFT,
+ (((unsigned long long) pfn + nr_pages) << PAGE_SHIFT) - 1);
+ memory_notify(MEM_CANCEL_ONLINE, &arg);
+ return ret;
}
#endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
@@ -1529,8 +1530,7 @@ do_migrate_range(unsigned long start_pfn
} else {
#ifdef CONFIG_DEBUG_VM
- printk(KERN_ALERT "removing pfn %lx from LRU failed\n",
- pfn);
+ pr_alert("removing pfn %lx from LRU failed\n", pfn);
dump_page(page, "failed to remove from LRU");
#endif
put_page(page);
@@ -1858,7 +1858,7 @@ repeat:
ret = -EBUSY;
goto failed_removal;
}
- printk(KERN_INFO "Offlined Pages %ld\n", offlined_pages);
+ pr_info("Offlined Pages %ld\n", offlined_pages);
/* Ok, all of our target is isolated.
We cannot do rollback at this point. */
offline_isolated_pages(start_pfn, end_pfn);
@@ -1895,9 +1895,9 @@ repeat:
return 0;
failed_removal:
- printk(KERN_INFO "memory offlining [mem %#010llx-%#010llx] failed\n",
- (unsigned long long) start_pfn << PAGE_SHIFT,
- ((unsigned long long) end_pfn << PAGE_SHIFT) - 1);
+ pr_debug("memory offlining [mem %#010llx-%#010llx] failed\n",
+ (unsigned long long) start_pfn << PAGE_SHIFT,
+ ((unsigned long long) end_pfn << PAGE_SHIFT) - 1);
memory_notify(MEM_CANCEL_OFFLINE, &arg);
/* pushback to free area */
undo_isolate_page_range(start_pfn, end_pfn, MIGRATE_MOVABLE);
_
Patches currently in -mm which might be from slaoub@xxxxxxxxx are
mm-memory-hotplug-print-debug-message-in-the-proper-way-for-online_pages.patch
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