The patch titled
call mm/page-writeback.c:set_ratelimit() when new pages are hot-added
has been added to the -mm tree. Its filename is
call-mm-page-writebackcset_ratelimit-when-new-pages.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: call mm/page-writeback.c:set_ratelimit() when new pages are hot-added
From: Chandra Seetharaman <sekharan@xxxxxxxxxx>
ratelimit_pages in page-writeback.c is recalculated (in set_ratelimit())
every time a CPU is hot-added/removed. But this value is not recalculated
when new pages are hot-added.
This patch fixes that problem by calling set_ratelimit() when new pages
are hot-added.
Signed-off-by: Chandra Seetharaman <sekharan@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
mm/memory_hotplug.c | 2 ++
mm/page-writeback.c | 2 +-
2 files changed, 3 insertions(+), 1 deletion(-)
diff -puN mm/memory_hotplug.c~call-mm-page-writebackcset_ratelimit-when-new-pages mm/memory_hotplug.c
--- a/mm/memory_hotplug.c~call-mm-page-writebackcset_ratelimit-when-new-pages
+++ a/mm/memory_hotplug.c
@@ -168,6 +168,7 @@ int online_pages(unsigned long pfn, unsi
unsigned long start_pfn;
struct zone *zone;
int need_zonelists_rebuild = 0;
+ extern void set_ratelimit(void);
/*
* This doesn't need a lock to do pfn_to_page().
@@ -218,6 +219,7 @@ int online_pages(unsigned long pfn, unsi
if (need_zonelists_rebuild)
build_all_zonelists();
vm_total_pages = nr_free_pagecache_pages();
+ set_ratelimit();
return 0;
}
#endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
diff -puN mm/page-writeback.c~call-mm-page-writebackcset_ratelimit-when-new-pages mm/page-writeback.c
--- a/mm/page-writeback.c~call-mm-page-writebackcset_ratelimit-when-new-pages
+++ a/mm/page-writeback.c
@@ -501,7 +501,7 @@ void laptop_sync_completion(void)
* will write six megabyte chunks, max.
*/
-static void set_ratelimit(void)
+void set_ratelimit(void)
{
ratelimit_pages = vm_total_pages / (num_online_cpus() * 32);
if (ratelimit_pages < 16)
_
Patches currently in -mm which might be from sekharan@xxxxxxxxxx are
remove-static-variable-mm-page-writebackctotal_pages.patch
call-mm-page-writebackcset_ratelimit-when-new-pages.patch
call-mm-page-writebackcset_ratelimit-when-new-pages-tidy.patch
add-srcu-based-notifier-chains.patch
-
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