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| author | Vitaly Kuznetsov <vkuznets@redhat.com> | 2015-03-27 19:10:12 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-04-03 17:18:02 +0300 |
| commit | 7fb0e1a65075a871c58cbcf8c877d1f9ae5cd83c (patch) | |
| tree | 4aa484c54f35be2d39f46243babe5e03da4a93e0 /drivers/hv | |
| parent | d6cbd2c3a3db437708520c66f285c69ef028ac1f (diff) | |
| download | linux-7fb0e1a65075a871c58cbcf8c877d1f9ae5cd83c.tar.xz | |
Drivers: hv: hv_balloon: eliminate jumps in piecewiese linear floor function
Commit 79208c57da53 ("Drivers: hv: hv_balloon: Make adjustments in computing
the floor") was inacurate as it introduced a jump in our piecewiese linear
'floor' function:
At 2048MB we have:
Left limit:
104 + 2048/8 = 360
Right limit:
256 + 2048/16 = 384 (so the right value is 232)
We now have to make an adjustment at 8192 boundary:
232 + 8192/16 = 744
512 + 8192/32 = 768 (so the right value is 488)
Suggested-by: Laszlo Ersek <lersek@redhat.com>
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>
Diffstat (limited to 'drivers/hv')
| -rw-r--r-- | drivers/hv/hv_balloon.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/hv/hv_balloon.c b/drivers/hv/hv_balloon.c index 99afef9393aa..4f5323cedab3 100644 --- a/drivers/hv/hv_balloon.c +++ b/drivers/hv/hv_balloon.c @@ -976,8 +976,8 @@ static unsigned long compute_balloon_floor(void) * 128 72 (1/2) * 512 168 (1/4) * 2048 360 (1/8) - * 8192 768 (1/16) - * 32768 1536 (1/32) + * 8192 744 (1/16) + * 32768 1512 (1/32) */ if (totalram_pages < MB2PAGES(128)) min_pages = MB2PAGES(8) + (totalram_pages >> 1); @@ -986,9 +986,9 @@ static unsigned long compute_balloon_floor(void) else if (totalram_pages < MB2PAGES(2048)) min_pages = MB2PAGES(104) + (totalram_pages >> 3); else if (totalram_pages < MB2PAGES(8192)) - min_pages = MB2PAGES(256) + (totalram_pages >> 4); + min_pages = MB2PAGES(232) + (totalram_pages >> 4); else - min_pages = MB2PAGES(512) + (totalram_pages >> 5); + min_pages = MB2PAGES(488) + (totalram_pages >> 5); #undef MB2PAGES return min_pages; } |