> -----Original Message----- > From: Vitaly Kuznetsov [mailto:vkuznets@xxxxxxxxxx] > Sent: Thursday, February 19, 2015 8:27 AM > To: KY Srinivasan; devel@xxxxxxxxxxxxxxxxxxxxxx > Cc: Haiyang Zhang; linux-kernel@xxxxxxxxxxxxxxx; Dexuan Cui > Subject: [PATCH 1/2] Drivers: hv: hv_balloon: report offline pages as being > used > > When hot-added memory pages are not brought online or when some > memory blocks > are sent offline the subsequent ballooning process kills the guest with OOM > killer. This happens as we don't report these pages as neither used nor free > and apparently host algorythm considers them as being unused. Keep track > of > all online/offline operations and report all currently offline pages as being > used so host won't try to balloon them out. > > Signed-off-by: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx> > --- > drivers/hv/hv_balloon.c | 33 ++++++++++++++++++++++++--------- > 1 file changed, 24 insertions(+), 9 deletions(-) > > diff --git a/drivers/hv/hv_balloon.c b/drivers/hv/hv_balloon.c > index a095b70..e4b4454 100644 > --- a/drivers/hv/hv_balloon.c > +++ b/drivers/hv/hv_balloon.c > @@ -503,6 +503,8 @@ struct hv_dynmem_device { > * Number of pages we have currently ballooned out. > */ > unsigned int num_pages_ballooned; > + unsigned int num_pages_onlined; > + unsigned int num_pages_added; > > /* > * State to manage the ballooning (up) operation. > @@ -556,12 +558,15 @@ static void post_status(struct hv_dynmem_device > *dm); > static int hv_memory_notifier(struct notifier_block *nb, unsigned long val, > void *v) > { > + struct memory_notify *mem = (struct memory_notify *)v; > + > switch (val) { > case MEM_GOING_ONLINE: > mutex_lock(&dm_device.ha_region_mutex); > break; > > case MEM_ONLINE: > + dm_device.num_pages_onlined += mem->nr_pages; > case MEM_CANCEL_ONLINE: Why are we not adjusting num_pages_onlined when we cancel the online Operation. K. Y _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
