Re: [RFC PATCH 0/6] virtio-trace: Support virtio-trace

2012-08-20 Thread Rusty Russell
On Thu, 9 Aug 2012 15:46:20 +0530, Amit Shah amit.s...@redhat.com wrote: Hi, On (Tue) 24 Jul 2012 [11:36:57], Yoshihiro YUNOMAE wrote: Hi All, The following patch set provides a low-overhead system for collecting kernel tracing data of guests by a host in a virtualization environment.

Re: [RFC PATCH 0/6] virtio-trace: Support virtio-trace

2012-08-20 Thread Amit Shah
On (Tue) 21 Aug 2012 [11:47:16], Rusty Russell wrote: On Thu, 9 Aug 2012 15:46:20 +0530, Amit Shah amit.s...@redhat.com wrote: Hi, On (Tue) 24 Jul 2012 [11:36:57], Yoshihiro YUNOMAE wrote: Hi All, The following patch set provides a low-overhead system for collecting kernel

Re: [RFC PATCH 0/6] virtio-trace: Support virtio-trace

2012-08-09 Thread Amit Shah
Hi, On (Tue) 24 Jul 2012 [11:36:57], Yoshihiro YUNOMAE wrote: Hi All, The following patch set provides a low-overhead system for collecting kernel tracing data of guests by a host in a virtualization environment. So I just have one minor comment, please post a non-RFC version of the patch.

Re: Re: [RFC PATCH 0/6] virtio-trace: Support virtio-trace

2012-07-27 Thread Yoshihiro YUNOMAE
Hi Amit, Thank you for commenting on our work. (2012/07/26 20:35), Amit Shah wrote: On (Tue) 24 Jul 2012 [11:36:57], Yoshihiro YUNOMAE wrote: [...] Therefore, we propose a new system virtio-trace, which uses enhanced virtio-serial and existing ring-buffer of ftrace, for collecting guest

Re: Re: [RFC PATCH 0/6] virtio-trace: Support virtio-trace

2012-07-27 Thread Amit Shah
On (Fri) 27 Jul 2012 [17:55:11], Yoshihiro YUNOMAE wrote: Hi Amit, Thank you for commenting on our work. (2012/07/26 20:35), Amit Shah wrote: On (Tue) 24 Jul 2012 [11:36:57], Yoshihiro YUNOMAE wrote: [...] Therefore, we propose a new system virtio-trace, which uses enhanced

Re: Re: Re: [RFC PATCH 0/6] virtio-trace: Support virtio-trace

2012-07-26 Thread Stefan Hajnoczi
On Wed, Jul 25, 2012 at 10:13 AM, Yoshihiro YUNOMAE yoshihiro.yunomae...@hitachi.com wrote: Hi Stefan, (2012/07/24 22:41), Stefan Hajnoczi wrote: On Tue, Jul 24, 2012 at 12:19 PM, Yoshihiro YUNOMAE yoshihiro.yunomae...@hitachi.com wrote: Are you using text formatted ftrace? No,

Re: [RFC PATCH 0/6] virtio-trace: Support virtio-trace

2012-07-26 Thread Amit Shah
On (Tue) 24 Jul 2012 [11:36:57], Yoshihiro YUNOMAE wrote: Hi All, The following patch set provides a low-overhead system for collecting kernel tracing data of guests by a host in a virtualization environment. A guest OS generally shares some devices with other guests or a host, so reasons

Re: Re: Re: [RFC PATCH 0/6] virtio-trace: Support virtio-trace

2012-07-25 Thread Yoshihiro YUNOMAE
Hi Stefan, (2012/07/24 22:41), Stefan Hajnoczi wrote: On Tue, Jul 24, 2012 at 12:19 PM, Yoshihiro YUNOMAE yoshihiro.yunomae...@hitachi.com wrote: Are you using text formatted ftrace? No, currently using raw format, but we'd like to reformat it in text. Capturing the info necessary to

Re: [RFC PATCH 0/6] virtio-trace: Support virtio-trace

2012-07-24 Thread Stefan Hajnoczi
On Tue, Jul 24, 2012 at 3:36 AM, Yoshihiro YUNOMAE yoshihiro.yunomae...@hitachi.com wrote: The performance of each method is compared as follows: [1] Native - only recording trace data to ring-buffer on a guest [2] Virtio-trace - running a trace agent on a guest - a reader

Re: Re: [RFC PATCH 0/6] virtio-trace: Support virtio-trace

2012-07-24 Thread Yoshihiro YUNOMAE
Hi Stefan, Thank you for commenting on our patch set. (2012/07/24 20:03), Masami Hiramatsu wrote: (2012/07/24 19:02), Stefan Hajnoczi wrote: On Tue, Jul 24, 2012 at 3:36 AM, Yoshihiro YUNOMAE yoshihiro.yunomae...@hitachi.com wrote: The performance of each method is compared as follows: [1]

Re: Re: [RFC PATCH 0/6] virtio-trace: Support virtio-trace

2012-07-24 Thread Stefan Hajnoczi
On Tue, Jul 24, 2012 at 12:19 PM, Yoshihiro YUNOMAE yoshihiro.yunomae...@hitachi.com wrote: Are you using text formatted ftrace? No, currently using raw format, but we'd like to reformat it in text. Capturing the info necessary to translate numbers into symbols is one of the problems of

Re: Re: [RFC PATCH 0/6] virtio-trace: Support virtio-trace

2012-07-24 Thread Stefan Hajnoczi
On Tue, Jul 24, 2012 at 12:03 PM, Masami Hiramatsu masami.hiramatsu...@hitachi.com wrote: (2012/07/24 19:02), Stefan Hajnoczi wrote: On Tue, Jul 24, 2012 at 3:36 AM, Yoshihiro YUNOMAE yoshihiro.yunomae...@hitachi.com wrote: The performance of each method is compared as follows: [1] Native

Re: [RFC PATCH 0/6] virtio-trace: Support virtio-trace

2012-07-24 Thread Masami Hiramatsu
(2012/07/24 11:36), Yoshihiro YUNOMAE wrote: Therefore, we propose a new system virtio-trace, which uses enhanced virtio-serial and existing ring-buffer of ftrace, for collecting guest kernel tracing data. In this system, there are 5 main components: (1) Ring-buffer of ftrace in a guest

Re: Re: [RFC PATCH 0/6] virtio-trace: Support virtio-trace

2012-07-24 Thread Masami Hiramatsu
(2012/07/24 19:02), Stefan Hajnoczi wrote: On Tue, Jul 24, 2012 at 3:36 AM, Yoshihiro YUNOMAE yoshihiro.yunomae...@hitachi.com wrote: The performance of each method is compared as follows: [1] Native - only recording trace data to ring-buffer on a guest [2] Virtio-trace -