| commit | c51c483d2b8ae66fe31a12509aedae02a6982ced | |
| author | Wilco Dijkstra <wdijkstr@arm.com> | |
| Thu, 11 Aug 2022 15:47:45 +0000 (11 16:47 +0100) | ||
| committer | Wilco Dijkstra <wdijkstr@arm.com> | |
| Thu, 11 Aug 2022 15:47:45 +0000 (11 16:47 +0100) | ||
| tree | c1da76a910cc6e015843c24b495c987237de916d | treesnapshot (tar.gz zip) |
| parent | 11f09947f3066f5ff84fd15ef22b72b46eea97a8 | commitdiff |
libio: Improve performance of IO locks
Improve performance of recursive IO locks by adding a fast path for
the single-threaded case. To reduce the number of memory accesses for
locking/unlocking, only increment the recursion counter if the lock
is already taken.
On Neoverse V1, a microbenchmark with many small freads improved by
2.9x. Multithreaded performance improved by 2%.
Reviewed-by: Cristian RodrÃguez <crrodriguez@opensuse.org>
Improve performance of recursive IO locks by adding a fast path for
the single-threaded case. To reduce the number of memory accesses for
locking/unlocking, only increment the recursion counter if the lock
is already taken.
On Neoverse V1, a microbenchmark with many small freads improved by
2.9x. Multithreaded performance improved by 2%.
Reviewed-by: Cristian RodrÃguez <crrodriguez@opensuse.org>
| sysdeps/nptl/stdio-lock.h | diffblobblamehistory |