Messages in this thread | | | Date | Sat, 29 May 1999 15:13:42 -0400 (EDT) | From | Alexander Viro <> | Subject | Re: pre-2.3.4.. |
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On Thu, 27 May 1999, Chuck Lever wrote:
> On Tue, 25 May 1999, Linus Torvalds wrote: > > There's a pre-2.3.4-1 out there in "testing" on ftp.kernel.org, which has > > the new scalable network code (well, the first cut of it, anyway). It also > > updates ISDN and PPC to newer versions. Please test it out and give > > feedback.. > > linus- > > 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.
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