[Bug nptl/33704] trylock throughput reduces significantly under high concurency load.

[skpgkp2 at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=33704

Sunil Pandey <skpgkp2 at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #16508|0                           |1
        is obsolete|                            |

--- Comment #7 from Sunil Pandey <skpgkp2 at gmail dot com> ---
Created attachment 16511
  --> https://sourceware.org/bugzilla/attachment.cgi?id=16511&action=edit
pthread_mutex_trylock_patch

We are interested about pthread_mutex_trylock case PTHREAD_MUTEX_TIMED_NP.

Attached patch improves throughput across board on x86. Following are skylake
server data.

Core count: 80

tcount baseline pthread_mutex_trylock speedup
80     232112   3119301               13.44x
64     247737   937424                3.78x
32     441441   888738                2.01x
16     863201   1529987               1.77x
8      1587950  2775892               1.75x
4      3208012  6487683               2.02x
2      7729917  11811184              1.53x

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