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Re: djprobes status

From: Ingo Molnar <mingo at redhat dot com>
To: Satoshi Oshima <soshima at redhat dot com>
Cc: "Frank Ch. Eigler" <fche at redhat dot com>, systemtap at sources dot redhat dot com, Masami Hiramatsu <masami dot hiramatsu dot pt at hitachi dot com>, sugita <yumiko dot sugita dot yf at hitachi dot com>
Date: Fri, 15 Sep 2006 21:04:07 +0200
Subject: Re: djprobes status
References: <20060914184609.GA4577@redhat.com> <450AAF4F.70902@redhat.com> <1158338554.8340.26.camel@earth> <450AF452.103@redhat.com> <1158346236.8340.43.camel@earth> <1158346762.8340.48.camel@earth>

On Fri, 2006-09-15 at 20:59 +0200, Ingo Molnar wrote:
> a third possibility would be to generate not a jump straight into the
> trampoline, but a jump to a kprobes-controlled function:
> 
a fourth possibility would be to insert a pushf/popf sequence:


	pushf
	jmp $tramp_addr
	popf

that makes the inserted code 2 bytes longer. A pushf/popf pair is 3-7
cycles on a modern CPU.

	Ingo

Follow-Ups:
- Re: djprobes status
  - From: Ingo Molnar

References:
- djprobes status
  - From: Frank Ch. Eigler
- Re: djprobes status
  - From: Satoshi Oshima
- Re: djprobes status
  - From: Ingo Molnar
- Re: djprobes status
  - From: Satoshi Oshima
- Re: djprobes status
  - From: Ingo Molnar
- Re: djprobes status
  - From: Ingo Molnar

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