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| author | Alex Ng <alexng@messages.microsoft.com> | 2017-08-06 22:12:53 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-08-16 18:14:42 +0200 |
| commit | 6df8d9aaf3afe25aacf20c69022a4c6d57b77a95 (patch) | |
| tree | 6a361758fbcf7304d46b07a60bb89d678cd1d77e /drivers/hv | |
| parent | Tools: hv: vss: Skip freezing filesystems backed by loop (diff) | |
| download | linux-6df8d9aaf3afe25aacf20c69022a4c6d57b77a95.tar.xz linux-6df8d9aaf3afe25aacf20c69022a4c6d57b77a95.zip | |
Drivers: hv: balloon: Correctly update onlined page count
Previously, num_pages_onlined was updated using value from memory online
notifier. This is incorrect because they assume that all hot-added pages
are online, even though we only online the amount that's backed by the
host. We should update num_pages_onlined only when the balloon driver
marks a page as online.
Signed-off-by: Alex Ng <alexng@messages.microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hv')
| -rw-r--r-- | drivers/hv/hv_balloon.c | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/drivers/hv/hv_balloon.c b/drivers/hv/hv_balloon.c index f5728deff893..0a5c318eedc1 100644 --- a/drivers/hv/hv_balloon.c +++ b/drivers/hv/hv_balloon.c @@ -584,10 +584,6 @@ static int hv_memory_notifier(struct notifier_block *nb, unsigned long val, switch (val) { case MEM_ONLINE: - spin_lock_irqsave(&dm_device.ha_lock, flags); - dm_device.num_pages_onlined += mem->nr_pages; - spin_unlock_irqrestore(&dm_device.ha_lock, flags); - /* Fall through */ case MEM_CANCEL_ONLINE: if (dm_device.ha_waiting) { dm_device.ha_waiting = false; @@ -644,6 +640,9 @@ static void hv_page_online_one(struct hv_hotadd_state *has, struct page *pg) __online_page_set_limits(pg); __online_page_increment_counters(pg); __online_page_free(pg); + + WARN_ON_ONCE(!spin_is_locked(&dm_device.ha_lock)); + dm_device.num_pages_onlined++; } static void hv_bring_pgs_online(struct hv_hotadd_state *has, |