5.10-stable patches

added patches:
	mm-memory_hotplug-rate-limit-page-migration-warnings.patch

diff --git a/queue-5.10/mm-memory_hotplug-rate-limit-page-migration-warnings.patch b/queue-5.10/mm-memory_hotplug-rate-limit-page-migration-warnings.patch
new file mode 100644 (file)
index 0000000..12853c0
--- /dev/null
+++ b/queue-5.10/mm-memory_hotplug-rate-limit-page-migration-warnings.patch
@@ -0,0 +1,67 @@
+From 786dee864804f8e851cf0f258df2ccbb4ee03d80 Mon Sep 17 00:00:00 2001
+From: Liam Mark <lmark@codeaurora.org>
+Date: Wed, 30 Jun 2021 18:52:43 -0700
+Subject: mm/memory_hotplug: rate limit page migration warnings
+
+From: Liam Mark <lmark@codeaurora.org>
+
+commit 786dee864804f8e851cf0f258df2ccbb4ee03d80 upstream.
+
+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>
+Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
+Cc: <pjy@amazon.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ mm/memory_hotplug.c |   16 +++++++++++-----
+ 1 file changed, 11 insertions(+), 5 deletions(-)
+
+--- a/mm/memory_hotplug.c
++++ b/mm/memory_hotplug.c
+@@ -1279,6 +1279,8 @@ do_migrate_range(unsigned long start_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))
+@@ -1325,8 +1327,10 @@ do_migrate_range(unsigned long start_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);
+       }
+@@ -1355,9 +1359,11 @@ do_migrate_range(unsigned long start_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);
+               }

diff --git a/queue-5.10/series b/queue-5.10/series
index ba420a23c1fc2e789def926b58d5a83ed1e002db..bc46ea16ee88e58c59e19bef86daf72d7d7b6abe 100644 (file)
--- a/queue-5.10/series
+++ b/queue-5.10/series
@@ -82,3 +82,4 @@ rdma-srp-fix-srp_abort.patch
 ravb-fix-use-after-free-issue-in-ravb_tx_timeout_work.patch
 dev_forward_skb-do-not-scrub-skb-mark-within-the-same-name-space.patch
 lib-kconfig.debug-do-not-enable-debug_preempt-by-default.patch
+mm-memory_hotplug-rate-limit-page-migration-warnings.patch