RE: [PATCH 00/05] robust per_cpu allocation for modules
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- To: "'Steven Rostedt'" <rostedt@xxxxxxxxxxx>, "LKML" <linux-kernel@xxxxxxxxxxxxxxx>, "Andrew Morton" <akpm@xxxxxxxx>
- Subject: RE: [PATCH 00/05] robust per_cpu allocation for modules
- From: "Chen, Kenneth W" <kenneth.w.chen@xxxxxxxxx>
- Date: Fri, 14 Apr 2006 15:12:52 -0700
- Cc: "Linus Torvalds" <torvalds@xxxxxxxx>, "Ingo Molnar" <mingo@xxxxxxx>, "Thomas Gleixner" <tglx@xxxxxxxxxxxxx>, "Andi Kleen" <ak@xxxxxxx>, "Martin Mares" <mj@xxxxxxxxxxxxxxxxxxxxxxxx>, <bjornw@xxxxxxxx>, <schwidefsky@xxxxxxxxxx>, <benedict.gaster@xxxxxxxxxx>, <lethal@xxxxxxxxxxxx>, "Chris Zankel" <chris@xxxxxxxxxx>, "Marc Gauthier" <marc@xxxxxxxxxxxxx>, "Joe Taylor" <joe@xxxxxxxxxxxxx>, "David Mosberger-Tang" <davidm@xxxxxxxxxx>, <rth@xxxxxxxxxxx>, <spyro@xxxxxxx>, <starvik@xxxxxxxx>, "Luck, Tony" <tony.luck@xxxxxxxxx>, <linux-ia64@xxxxxxxxxxxxxxx>, <ralf@xxxxxxxxxxxxxx>, <linux-mips@xxxxxxxxxxxxxx>, <grundler@xxxxxxxxxxxxxxxx>, <parisc-linux@xxxxxxxxxxxxxxxx>, <linuxppc-dev@xxxxxxxxxx>, <paulus@xxxxxxxxx>, <linux390@xxxxxxxxxx>, <lethal@xxxxxxxxxxxx>, <davem@xxxxxxxxxxxxx>, <chris@xxxxxxxxxx>
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Steven Rostedt wrote on Friday, April 14, 2006 2:19 PM
> So the current solution has two flaws:
> 1. not robust. If we someday add more modules that together take up
> more than 14K, we need to manually update the PERCPU_ENOUGH_ROOM.
> 2. waste of memory. We have 14K of memory wasted per CPU. Remember
> a 64 processor machine would be wasting 896K of memory!
If someone who has the money to own a 64-process machine, 896K of memory
is pocket change ;-)
- Ken
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