Tejun Heo wrote:
01_brsem_implement_brsem.patch
This patch implements big reader semaphore - a rwsem with very
cheap reader-side operations and very expensive writer-side
operations. For details, please read comments at the top of
kern/brsem.c.
This thing looks pretty overengineered. It is difficult to
read with all the little wrapper functions and weird naming
schemes.
What would be wrong with an array of NR_CPUS rwsems? The only
tiny trick you would have to do AFAIKS is have up_read remember
what rwsem down_read took, but that could be returned from
down_read as a token.
I have been meaning to do something like this for mmap_sem to
see what happens to page fault scalability (though the heavy
write-side would make such a scheme unsuitable for mainline).
--
SUSE Labs, Novell Inc.
Send instant messages to your online friends http://au.messenger.yahoo.com
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
| |
 |