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Drivers: hv: hv_balloon: Make adjustments in computing the floor

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Make adjustments in computing the balloon floor. The current computation
of the balloon floor was not appropriate for virtual machines with more than
10 GB of assigned memory - we would get into situations where the host would
agressively balloon down the guest and leave the guest in an unusable state.
This patch fixes the issue by raising the floor.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
K. Y. Srinivasan 2015-01-09 23:54:29 -08:00 committed by Greg Kroah-Hartman
parent c1136da621
commit 79208c57da
1 changed files with 5 additions and 4 deletions
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9
drivers/hv/hv_balloon.c
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@ -928,9 +928,8 @@ static unsigned long compute_balloon_floor(void)
* 128 72 (1/2) * 128 72 (1/2)
* 512 168 (1/4) * 512 168 (1/4)
* 2048 360 (1/8) * 2048 360 (1/8)
* 8192 552 (1/32) * 8192 768 (1/16)
* 32768 1320 * 32768 1536 (1/32)
* 131072 4392
*/ */
if (totalram_pages < MB2PAGES(128)) if (totalram_pages < MB2PAGES(128))
min_pages = MB2PAGES(8) + (totalram_pages >> 1); min_pages = MB2PAGES(8) + (totalram_pages >> 1);
@ -938,8 +937,10 @@ static unsigned long compute_balloon_floor(void)
min_pages = MB2PAGES(40) + (totalram_pages >> 2); min_pages = MB2PAGES(40) + (totalram_pages >> 2);
else if (totalram_pages < MB2PAGES(2048)) else if (totalram_pages < MB2PAGES(2048))
min_pages = MB2PAGES(104) + (totalram_pages >> 3); min_pages = MB2PAGES(104) + (totalram_pages >> 3);
else if (totalram_pages < MB2PAGES(8192))
min_pages = MB2PAGES(256) + (totalram_pages >> 4);
else else
min_pages = MB2PAGES(296) + (totalram_pages >> 5); min_pages = MB2PAGES(512) + (totalram_pages >> 5);
#undef MB2PAGES #undef MB2PAGES
return min_pages; return min_pages;
} }