@@ -3203,7 +3203,7 @@ extern void memory_failure_queue_kick(int cpu);
extern int unpoison_memory(unsigned long pfn);
extern int sysctl_memory_failure_early_kill;
extern int sysctl_memory_failure_recovery;
-extern void shake_page(struct page *p, int access);
+extern void shake_page(struct page *p);
extern atomic_long_t num_poisoned_pages __read_mostly;
extern int soft_offline_page(unsigned long pfn, int flags);
@@ -30,7 +30,7 @@ static int hwpoison_inject(void *data, u64 val)
if (!hwpoison_filter_enable)
goto inject;
- shake_page(hpage, 0);
+ shake_page(hpage);
/*
* This implies unable to support non-LRU pages.
*/
@@ -282,9 +282,9 @@ static int kill_proc(struct to_kill *tk, unsigned long pfn, int flags)
/*
* Unknown page type encountered. Try to check whether it can turn PageLRU by
- * lru_add_drain_all, or a free page by reclaiming slabs when possible.
+ * lru_add_drain_all.
*/
-void shake_page(struct page *p, int access)
+void shake_page(struct page *p)
{
if (PageHuge(p))
return;
@@ -296,11 +296,9 @@ void shake_page(struct page *p, int access)
}
/*
- * Only call drop_slab_node here (which would also shrink
- * other caches) if access is not potentially fatal.
+ * TODO: Could shrink slab caches here if a lightweight range-based
+ * shrinker will be available.
*/
- if (access)
- drop_slab_node(page_to_nid(p));
}
EXPORT_SYMBOL_GPL(shake_page);
@@ -1205,7 +1203,7 @@ static int get_any_page(struct page *p, unsigned long flags)
* page, retry.
*/
if (pass++ < 3) {
- shake_page(p, 1);
+ shake_page(p);
goto try_again;
}
ret = -EIO;
@@ -1222,7 +1220,7 @@ static int get_any_page(struct page *p, unsigned long flags)
*/
if (pass++ < 3) {
put_page(p);
- shake_page(p, 1);
+ shake_page(p);
count_increased = false;
goto try_again;
}
@@ -1369,7 +1367,7 @@ static bool hwpoison_user_mappings(struct page *p, unsigned long pfn,
* shake_page() again to ensure that it's flushed.
*/
if (mlocked)
- shake_page(hpage, 0);
+ shake_page(hpage);
/*
* Now that the dirty bit has been propagated to the
@@ -1723,7 +1721,7 @@ int memory_failure(unsigned long pfn, int flags)
* The check (unnecessarily) ignores LRU pages being isolated and
* walked by the page reclaim code, however that's not a big loss.
*/
- shake_page(p, 0);
+ shake_page(p);
lock_page(p);
In the current implementation of soft offline, if non-LRU page is met, all the slab caches will be dropped to free the page then offline. But if the page is not slab page all the effort is wasted in vain. Even though it is a slab page, it is not guaranteed the page could be freed at all. However the side effect and cost is quite high. It does not only drop the slab caches, but also may drop a significant amount of page caches which are associated with inode caches. It could make the most workingset gone in order to just offline a page. And the offline is not guaranteed to succeed at all, actually I really doubt the success rate for real life workload. Furthermore the worse consequence is the system may be locked up and unusable since the page cache release may incur huge amount of works queued for memcg release. Actually we ran into such unpleasant case in our production environment. Firstly, the workqueue of memory_failure_work_func is locked up as below: BUG: workqueue lockup - pool cpus=1 node=0 flags=0x0 nice=0 stuck for 53s! Showing busy workqueues and worker pools: workqueue events: flags=0x0 pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=14/256 refcnt=15 in-flight: 409271:memory_failure_work_func pending: kfree_rcu_work, kfree_rcu_monitor, kfree_rcu_work, rht_deferred_worker, rht_deferred_worker, rht_deferred_worker, rht_deferred_worker, kfree_rcu_work, kfree_rcu_work, kfree_rcu_work, kfree_rcu_work, drain_local_stock, kfree_rcu_work workqueue mm_percpu_wq: flags=0x8 pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 refcnt=2 pending: vmstat_update workqueue cgroup_destroy: flags=0x0 pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/1 refcnt=12072 pending: css_release_work_fn There were over 12K css_release_work_fn queued, and this caused a few lockups due to the contention of worker pool lock with IRQ disabled, for example: NMI watchdog: Watchdog detected hard LOCKUP on cpu 1 Modules linked in: amd64_edac_mod edac_mce_amd crct10dif_pclmul crc32_pclmul ghash_clmulni_intel xt_DSCP iptable_mangle kvm_amd bpfilter vfat fat acpi_ipmi i2c_piix4 usb_storage ipmi_si k10temp i2c_core ipmi_devintf ipmi_msghandler acpi_cpufreq sch_fq_codel xfs libcrc32c crc32c_intel mlx5_core mlxfw nvme xhci_pci ptp nvme_core pps_core xhci_hcd CPU: 1 PID: 205500 Comm: kworker/1:0 Tainted: G L 5.10.32-t1.el7.twitter.x86_64 #1 Hardware name: TYAN F5AMT /z /S8026GM2NRE-CGN, BIOS V8.030 03/30/2021 Workqueue: events memory_failure_work_func RIP: 0010:queued_spin_lock_slowpath+0x41/0x1a0 Code: 41 f0 0f ba 2f 08 0f 92 c0 0f b6 c0 c1 e0 08 89 c2 8b 07 30 e4 09 d0 a9 00 01 ff ff 75 1b 85 c0 74 0e 8b 07 84 c0 74 08 f3 90 <8b> 07 84 c0 75 f8 b8 01 00 00 00 66 89 07 c3 f6 c4 01 75 04 c6 47 RSP: 0018:ffff9b2ac278f900 EFLAGS: 00000002 RAX: 0000000000480101 RBX: ffff8ce98ce71800 RCX: 0000000000000084 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8ce98ce6a140 RBP: 00000000000284c8 R08: ffffd7248dcb6808 R09: 0000000000000000 R10: 0000000000000003 R11: ffff9b2ac278f9b0 R12: 0000000000000001 R13: ffff8cb44dab9c00 R14: ffffffffbd1ce6a0 R15: ffff8cacaa37f068 FS: 0000000000000000(0000) GS:ffff8ce98ce40000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fcf6e8cb000 CR3: 0000000a0c60a000 CR4: 0000000000350ee0 Call Trace: __queue_work+0xd6/0x3c0 queue_work_on+0x1c/0x30 uncharge_batch+0x10e/0x110 mem_cgroup_uncharge_list+0x6d/0x80 release_pages+0x37f/0x3f0 __pagevec_release+0x1c/0x50 __invalidate_mapping_pages+0x348/0x380 ? xfs_alloc_buftarg+0xa4/0x120 [xfs] inode_lru_isolate+0x10a/0x160 ? iput+0x1d0/0x1d0 __list_lru_walk_one+0x7b/0x170 ? iput+0x1d0/0x1d0 list_lru_walk_one+0x4a/0x60 prune_icache_sb+0x37/0x50 super_cache_scan+0x123/0x1a0 do_shrink_slab+0x10c/0x2c0 shrink_slab+0x1f1/0x290 drop_slab_node+0x4d/0x70 soft_offline_page+0x1ac/0x5b0 ? dev_mce_log+0xee/0x110 ? notifier_call_chain+0x39/0x90 memory_failure_work_func+0x6a/0x90 process_one_work+0x19e/0x340 ? process_one_work+0x340/0x340 worker_thread+0x30/0x360 ? process_one_work+0x340/0x340 kthread+0x116/0x130 The lockup made the machine is quite unusable. And it also made the most workingset gone, the reclaimabled slab caches were reduced from 12G to 300MB, the page caches were decreased from 17G to 4G. But the most disappointing thing is all the effort doesn't make the page offline, it just returns: soft_offline: 0x1469f2: unknown non LRU page type 5ffff0000000000 () It seems the aggressive behavior for non-LRU page didn't pay back, so it doesn't make too much sense to keep it considering the terrible side effect. Reported-by: David Mackey <tdmackey@twitter.com> Acked-by: Naoya Horiguchi <naoya.horiguchi@nec.com> Acked-by: David Hildenbrand <david@redhat.com> Cc: Oscar Salvador <osalvador@suse.de> Signed-off-by: Yang Shi <shy828301@gmail.com> --- v3: * Collected acks v2: * Rebased on top of https://lore.kernel.org/linux-mm/CAHbLzkpAEZRTmnOnjVHYHGJ7ApjdC8eDh53DAnTHsG185QGOfQ@mail.gmail.com/T/#t (Naoya Horiguchi) * Added comment about possible future optimization when handling slab page (David Hildenbrand) * Added patch #3 to call dump_page (Matthew Wilcox) include/linux/mm.h | 2 +- mm/hwpoison-inject.c | 2 +- mm/memory-failure.c | 18 ++++++++---------- 3 files changed, 10 insertions(+), 12 deletions(-)