Re: [PATCH] Support for additional proces performance metrics in 2.3.33
Manfred Spraul (manfreds@colorfullife.com)
Sun, 19 Dec 1999 16:42:49 +0100
Serge Robyns wrote:
>
> Maybe some should check the ll_rw_blk patch against SMP as I'm affraid it
> isn't SMP safe.
> (I using the current process pointer without accuiring any lock).
>
It's SMP safe:
You are using the current _thread_ pointer, and since a thread can never
run on more than one cpu at the same time, you don't need a lock. A user
space programm could read the counters for all thread that belong to a
process, and then it could print the result. AFAIK the kernel has no
concept of "process", it only deals with threads.
Cheers,
Manfred
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