| commit | 4498e2b25bc17ace502b4c86c551dbab25f284bf | |
| author | Maksim Panchenko <maks@fb.com> | |
| Wed, 27 May 2015 22:35:56 +0000 (27 15:35 -0700) | ||
| committer | hhvm-bot <hhvm-bot@fb.com> | |
| Wed, 27 May 2015 23:00:39 +0000 (27 16:00 -0700) | ||
| tree | 1da510e48e7ff681b1040bbb63f05351cd5b61db | treesnapshot (tar.gz zip) |
| parent | 3ecb3e99619f1c5b8189748a98f9670b3f20d59d | commitdiff |
Adjust starting address of TC automatically.
Summary: HHVM performance can get affected by a size of .text section.
Every size increase of 2MB causes TC to start at a new boundary.
It appears that if the new boundary is offset from the start
of hot text by even number of 2MB pages, we get penalized.
This diff is meant to stabilize performance by keeping
the distance at odd number of 2MB pages regardless of .text
size and location.
Reviewed By: @markw65
Differential Revision: D2103054
Summary: HHVM performance can get affected by a size of .text section.
Every size increase of 2MB causes TC to start at a new boundary.
It appears that if the new boundary is offset from the start
of hot text by even number of 2MB pages, we get penalized.
This diff is meant to stabilize performance by keeping
the distance at odd number of 2MB pages regardless of .text
size and location.
Reviewed By: @markw65
Differential Revision: D2103054