Re: pre-2.3.4..
Chuck Lever (cel@monkey.org)
Sat, 29 May 1999 19:01:59 -0400 (EDT)
On Sat, 29 May 1999, Alexander Viro wrote:
> On Thu, 27 May 1999, Chuck Lever wrote:
> > attached is a patch that removes the global kernel lock from brk() and
> > when doing anonymous mmap(). it also reorganizes the locking logic in
> > handle_pte_fault() to reduce the amount of time spent with the lock held
> > needlessly. the handle_pte_fault() change may be more dangerous than the
> > brk() and mmap() changes. it may also be unnecessary with the upcoming
> > parallelized page cache.
>
> Chuck, it's unsafe. do_munmap() called from sys_brk() (or from do_mmap()
> for that matter) may lead to ->f_count changes, which is *not* the thing
> you want to do without big lock.
i don't think it will do this for anonymous maps used by sys_brk().
- Chuck Lever
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