On 01/06/2012 11:15 AM, Torvald Riegel wrote:
> libitm: Optimize undo log.
>
> libitm/
> * local.cc (GTM_LB): Use GTM::gtm_undolog.
> (GTM::gtm_thread::drop_references_undolog): Remove.
> (GTM::gtm_thread::commit_undolog,
> GTM::gtm_thread::rollback_undolog):
This fixes a known, obvious performance problem in libitm's undo log:
Before, each write was put into a separately allocated buffer, which
kills performance. With the patch, everything goes into a single
buffer: Undo data first, then the length of the data, then the address.
We only need this data
