Serapheim Dimitropoulos ec1fea4516 Use percpu_counter for obj_alloc counter of Linux-backed caches ... A previous commit enabled the tracking of object allocations in Linux-backed caches from the SPL layer for debuggability. The commit is: 9a170fc6fe54f1e852b6c39630fe5ef2bbd97c16 Unfortunately, it also introduced minor performance regressions that were highlighted by the ZFS perf test-suite. Within Delphix we found that the regression would be from -1%, all the way up to -8% for some workloads. This commit brings performance back up to par by creating a separate counter for those caches and making it a percpu in order to avoid lock-contention. The initial performance testing was done by myself, and the final round was conducted by @tonynguien who was also the one that discovered the regression and highlighted the culprit. Reviewed-by: Matt Ahrens <matt@delphix.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Serapheim Dimitropoulos <serapheim@delphix.com> Closes #10397		2020-06-26 18:06:50 -07:00
..
spl	Use percpu_counter for obj_alloc counter of Linux-backed caches	2020-06-26 18:06:50 -07:00
zfs	ARC shrinking blocks reads/writes	2020-06-26 10:42:27 -07:00