sx locks rewriting - needs testers

Attilio Rao attilio at
Fri Oct 27 18:33:06 UTC 2006

2006/10/19, Attilio Rao <attilio at>:
> In my P4 branch: //depot/user/attilio/attilio_smpng/...
> you can find a sx locks rewriting using the optimized semantic of
> rwlocks; in the end this might result in a valuable performance
> improvement.
> Some hints about it:
> - new sx locks alredy support inlined s*lock operations and try* operations;
>   (they have a fully functional support)
> - new sx locks doesn't have support for adaptive spinning yet; this is beacause
>    the code is under revision even for mutex/rwlock.
> - we could allow a sharers tracking in debugging mode, at least, in
> order to detect
>   eventual recursion in slock operation
> - currently, sx locks mantain the exclusive holder tracking even if this is not
>    really necessary (we can get rid of it).
> In this moment a strong phase of test is *very* welcome, so please,
> for every people having a p4 account, dowload the kernel and try to
> put it under stress (at this purpose I cc'ed, in particular, kris@,
> pho@ and jhb@ in order to have tests, revisions, etc. etc.)

Maybe I did a stupid thing not directly posting diffs (so that all the
people interested can nicely check/try):


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