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FROMGIT: mm/memory_hotplug: rate limit page migration warnings

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When offlining memory the system can attempt to migrate a lot of pages, if
there are problems with migration this can flood the logs.  Printing all
the data hogs the CPU and cause some RT threads to run for a long time,
which may have some bad consequences.

Rate limit the page migration warnings in order to avoid this.

Link: https://lkml.kernel.org/r/20210505140542.24935-1-georgi.djakov@linaro.org
Signed-off-by: Liam Mark <lmark@codeaurora.org>
Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
Cc: David Hildenbrand <david@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Bug: 187917022
(cherry picked from commit 6be9af0e0f77 https: //github.com/hnaz/linux-mm.git v5.13-rc1-mmots-2021-05-10-22-15)
Change-Id: I6754d380f8c31cf9b699c242edacf593807ef2b1
Signed-off-by: Chris Goldsworthy <quic_cgoldswo@quicinc.com>
This commit is contained in:
Liam Mark 2021-05-11 09:58:22 -04:00 • committed by Chris Goldsworthy
commit 4738608080
1 changed files with 11 additions and 5 deletions
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16
mm/memory_hotplug.c
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@ -1318,6 +1318,8 @@ do_migrate_range(unsigned long start_pfn, unsigned long end_pfn)
struct page *page, *head;
int ret = 0;
LIST_HEAD(source);
static DEFINE_RATELIMIT_STATE(migrate_rs, DEFAULT_RATELIMIT_INTERVAL,
DEFAULT_RATELIMIT_BURST);
for (pfn = start_pfn; pfn < end_pfn; pfn++) {
if (!pfn_valid(pfn))
@ -1364,8 +1366,10 @@ do_migrate_range(unsigned long start_pfn, unsigned long end_pfn)
page_is_file_lru(page));
} else {
pr_warn("failed to isolate pfn %lx\n", pfn);
dump_page(page, "isolation failed");
if (__ratelimit(&migrate_rs)) {
pr_warn("failed to isolate pfn %lx\n", pfn);
dump_page(page, "isolation failed");
}
}
put_page(page);
}
@ -1394,9 +1398,11 @@ do_migrate_range(unsigned long start_pfn, unsigned long end_pfn)
(unsigned long)&mtc, MIGRATE_SYNC, MR_MEMORY_HOTPLUG);
if (ret) {
list_for_each_entry(page, &source, lru) {
pr_warn("migrating pfn %lx failed ret:%d ",
page_to_pfn(page), ret);
dump_page(page, "migration failure");
if (__ratelimit(&migrate_rs)) {
pr_warn("migrating pfn %lx failed ret:%d\n",
page_to_pfn(page), ret);
dump_page(page, "migration failure");
}
}
putback_movable_pages(&source);
}