Re: [PATCH v2 0/4] ipc: reduce ipc lock contention

[Rik van Riel]

On 03/05/2013 10:46 PM, Waiman Long wrote:
> On 03/05/2013 03:53 PM, Rik van Riel wrote:

> > Indeed.  Though how well my patches will work with Oracle will
> > depend a lot on what kind of semctl syscalls they are doing.
> >
> > Does Oracle typically do one semop per semctl syscall, or does
> > it pass in a whole bunch at once?
>
> i had collected a strace log of Oracle instance startup a while ago. In
> the log, almost all of the semctl() call is to set a single semaphore
> value in one of the element of the array using SETVAL. Also there are
> far more semtimedop() than semctl(), about 100:1. Again, all the
> semtimedop() operations are on a single element of the semaphore array.

That is good to hear. Just what I was hoping when I started
working on my patches. You should expect them tomorrow or
Thursday.

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