Re: UVM emap implementation

To: tech-kern%netbsd.org@localhost, ad%netbsd.org@localhost
Subject: Re: UVM emap implementation
From: Mindaugas Rasiukevicius <rmind%netbsd.org@localhost>
Date: Thu, 25 Jun 2009 01:04:51 +0100

Mindaugas Rasiukevicius <rmind%netbsd.org@localhost> wrote:
> Currently, zero-copy on MP is disabled due to expensive TLB flushes and IPIs
> on modern SMP systems (at least, x86). The following patch is the ephemeral
> mapping (emap) implementation, which should address the performance issues.
> For now, only x86 utilizes these improvements (pmap changes are required).
> 
> http://www.netbsd.org/~rmind/uvm_emap.diff

FYI: Patch updated. Assembly code was amended, since few more registers in
IPI context have to be saved due to calls to C functions. More comments added.

-- 
Best regards,
Mindaugas

References:
- UVM emap implementation
  - From: Mindaugas Rasiukevicius

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