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

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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  • [PATCH RFC] big reader semaphore take#2
    • From: Tejun Heo <[email protected]>

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