mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2025-01-22 10:34:26 +07:00
8ac75b96be
The afu fd release path was identified as a significant bottleneck in the overall performance of cxl. While an optimal AFU design would minimise the need to close & reopen the AFU fd, it is not always practical to avoid. The bottleneck seems to be down to the call to synchronize_rcu(), which will block until every other thread is guaranteed to be out of an RCU critical section. Replace it with call_rcu() to free the context structures later so we can return to the application sooner. This reduces the time spent in the fd release path from 13356 usec to 13.3 usec - about a 100x speed up. Reported-by: Fei K Chen <uchen@cn.ibm.com> Signed-off-by: Ian Munsie <imunsie@au1.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> |
||
|---|---|---|
| .. | ||
| base.c | ||
| context.c | ||
| cxl.h | ||
| debugfs.c | ||
| fault.c | ||
| file.c | ||
| irq.c | ||
| Kconfig | ||
| main.c | ||
| Makefile | ||
| native.c | ||
| pci.c | ||
| sysfs.c | ||
| trace.c | ||
| trace.h | ||