* Performance testing of d_alloc_parallel().
@ 2022-06-01 12:12 Sebastian Andrzej Siewior
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From: Sebastian Andrzej Siewior @ 2022-06-01 12:12 UTC (permalink / raw)
To: linux-fsdevel; +Cc: Al Viro, Thomas Gleixner
Hi,
I've been looking in to testing d_alloc_parallel() for correctness and
performance after making changes to it. I haven't found anything useful.
I hacked one .c file to fill a directory with other directories and then
I hacked another .c file to walk/ scan that directory with multiple
threads. I don't see much wakes (due to DCACHE_PAR_LOOKUP) on shm. This
is different on xfs.
The runtime of the walk/ scan directory varies a lot so I can't spot a
difference between orig vs patched. On shm I have a span between 15 and
55 secs.
Any suggestions?
Sebastian
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