diff options
| -rw-r--r-- | drivers/hv/hv_balloon.c | 35 |
1 files changed, 34 insertions, 1 deletions
diff --git a/drivers/hv/hv_balloon.c b/drivers/hv/hv_balloon.c index f8fc99600de8..37873213e24f 100644 --- a/drivers/hv/hv_balloon.c +++ b/drivers/hv/hv_balloon.c @@ -523,6 +523,34 @@ static void process_info(struct hv_dynmem_device *dm, struct dm_info_msg *msg) } } +unsigned long compute_balloon_floor(void) +{ + unsigned long min_pages; +#define MB2PAGES(mb) ((mb) << (20 - PAGE_SHIFT)) + /* Simple continuous piecewiese linear function: + * max MiB -> min MiB gradient + * 0 0 + * 16 16 + * 32 24 + * 128 72 (1/2) + * 512 168 (1/4) + * 2048 360 (1/8) + * 8192 552 (1/32) + * 32768 1320 + * 131072 4392 + */ + if (totalram_pages < MB2PAGES(128)) + min_pages = MB2PAGES(8) + (totalram_pages >> 1); + else if (totalram_pages < MB2PAGES(512)) + min_pages = MB2PAGES(40) + (totalram_pages >> 2); + else if (totalram_pages < MB2PAGES(2048)) + min_pages = MB2PAGES(104) + (totalram_pages >> 3); + else + min_pages = MB2PAGES(296) + (totalram_pages >> 5); +#undef MB2PAGES + return min_pages; +} + /* * Post our status as it relates memory pressure to the * host. Host expects the guests to post this status @@ -552,9 +580,14 @@ static void post_status(struct hv_dynmem_device *dm) * The host expects the guest to report free memory. * Further, the host expects the pressure information to * include the ballooned out pages. + * For a given amount of memory that we are managing, we + * need to compute a floor below which we should not balloon. + * Compute this and add it to the pressure report. */ status.num_avail = val.freeram; - status.num_committed = vm_memory_committed() + dm->num_pages_ballooned; + status.num_committed = vm_memory_committed() + + dm->num_pages_ballooned + + compute_balloon_floor(); vmbus_sendpacket(dm->dev->channel, &status, sizeof(struct dm_status), |