Re: [Qemu-devel] [PATCH 0/2] Introduce QemuRWLock

[Jan Kiszka]

On 2011-10-03 13:23, Harsh Prateek Bora wrote:
> SynthFS uses rwlocks, which raise the need of a generic QemuRWLock APIs.
> This patchset introduces the same making necessary changes to relevant code.

Is the impact of using a plain mutex measurable with 9pfs? Usually it
takes very heavy write sections or highly concurrent read sections to
actually make a difference. Looking at the cited code, I would dare to
rule out the former (even more if the malloc was moved out of the
critical section). But I cannot assess the latter.

If it does matter, I would vote for introducing RCU directly.

Jan

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