diff options
| author | Vitaly Kuznetsov | 2015-02-28 11:39:00 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman | 2015-03-01 19:31:47 -0800 |
| commit | 530d15b907038735d4cb008dc5caae7ce4dfc985 (patch) | |
| tree | d2aabc77cd6e1da385959ddc4d2910c59eb39520 | |
| parent | 549fd280b145e2154db5a7d06981d041f8bbf597 (diff) | |
Drivers: hv: hv_balloon: refuse to balloon below the floor
When host asks us to balloon up we need to be sure we're not committing suicide
by overballooning. Use already existent 'floor' metric as our lowest possible
value for free ram.
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/hv/hv_balloon.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/hv/hv_balloon.c b/drivers/hv/hv_balloon.c index 53932b3e1973..c5bb87244dd7 100644 --- a/drivers/hv/hv_balloon.c +++ b/drivers/hv/hv_balloon.c @@ -1138,6 +1138,8 @@ static void balloon_up(struct work_struct *dummy) bool alloc_error; bool done = false; int i; + struct sysinfo val; + unsigned long floor; /* The host balloons pages in 2M granularity. */ WARN_ON_ONCE(num_pages % PAGES_IN_2M != 0); @@ -1148,6 +1150,15 @@ static void balloon_up(struct work_struct *dummy) */ alloc_unit = 512; + si_meminfo(&val); + floor = compute_balloon_floor(); + + /* Refuse to balloon below the floor, keep the 2M granularity. */ + if (val.freeram - num_pages < floor) { + num_pages = val.freeram > floor ? (val.freeram - floor) : 0; + num_pages -= num_pages % PAGES_IN_2M; + } + while (!done) { bl_resp = (struct dm_balloon_response *)send_buffer; memset(send_buffer, 0, PAGE_SIZE); |