[PATCH]: acct_process() locking and exit1()
Roman Divacky
rdivacky at freebsd.org
Thu Jun 14 07:58:32 UTC 2007
On Thu, Jun 14, 2007 at 09:54:39AM +0200, Roman Divacky wrote:
> hi
>
> currently in exit1() we call acct_process() with Giant held.
> I looked at the code and I think this is because of tty need
> for Giant locking. Because of this we have to release process limit
> in a separate PROC_LOCK()/UNLOCK() block.
>
> my just-to-look-at patch does this
>
> 1) moves the acct_process() in exit1() out of Giant locked block (upward)
> 2) acquires Giant in the acct_process() around tty handling
> 3) moves the p->p_limit to a different PROC_LOCK/UNLOCK block (upward)
>
> the result is saving 2 proc mtx operations in exit1()
>
> can you look at it and tell me if its correct or wrong or something like that?
>
> if it's correct is it worth committing? saving two mtx operations is a nice thing :)
erm... two bugs ;) "saving two mtx operations..." in the typical case of accounting
NOT being enabled.
and forgot to show the patch ;) it's here
www.vlakno.cz/~rdivacky/kern_acct.patch
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