Messages in this thread | | | Date | Fri, 8 Feb 2002 13:38:06 -0500 | From | Arjan van de Ven <> | Subject | Re: [patch] larger kernel stack (8k->16k) per task |
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On Fri, Feb 08, 2002 at 01:29:16PM -0500, Richard B. Johnson wrote: > I think it is entirely inefficient to call an external procedure > for temporary variable space when the actual math is done by the > compiler at compile time, and the code is a simple subtraction, then > later-on a simple addition to a single register!
Depends. If you need a few bytes (and upto 1Kb I'd call a few bytes if you're careful), then stack usage is fine. If you need more, well, kmalloc is some 100 cycles...
> If the kernel does not provide sufficient stack-space for small > buffers and structures, it is a kernel problem,
notice the *small*
The alternative is to double the amount of PER PROCESS overhead in terms of unswappable memory... Even 1 disk IO will hurt more than your kmalloc of 4Kb of "small buffers and structures" will in a year.
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