On Thu, Jun 02, 2016 at 02:28:36PM +0800, Huang, Ying wrote: > "Huang, Ying" <[email protected]> writes:
> Here is the comparison result with perf profile information. You can > find it via searching 'perf-profile'. [snip] Looks like this load is hitting the arseloads of contention cases of spin_lock() on various ->d_lock inside dcache_readdir(). With exclusive lock on directory most of them end up uncontended... I'll try to see what can be done there; quite a bit of those are actually due to moving the cursor on every step. I wonder if we could do the list traversals with something less drastic - the real contents changes are prevented by the shared lock on directory being held, after all... I'll play with that and post when I get somewhere with it...
