Re: [PATCH RFC] big reader semaphore take#2

[Nick Piggin]

Tejun Heo wrote:
>  Hello guys,
>
> This is the second take of brsem (big reader semaphore).
>
> Nick, unfortunately, simple array of rwsem's does not work as lock
> holders are not pinned down to cpus and may release locks on other
> cpus.

That's right. It would require down_read to return the index
or a pointer to the lock that it took, and to pass that into
up_read. So it wouldn't be a completely drop-in replacement
for a regular semaphore if that's what you had in mind?

Nick

--
SUSE Labs, Novell Inc.

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