[PATCH 01/16] [PATCH v3 1/12] Introduce cyclic mode to keep memory usage constant.

[Atsushi Kumagai]

Hello HATAYAMA-san,

On Mon, 03 Sep 2012 12:16:37 +0900 (JST)
HATAYAMA Daisuke <d.hatayama at jp.fujitsu.com> wrote:

> From: HATAYAMA Daisuke <d.hatayama at jp.fujitsu.com>
> Subject: Re: [PATCH 01/16] [PATCH v3 1/12] Introduce cyclic mode to keep memory usage constant.
> Date: Mon, 3 Sep 2012 11:50:57 +0900
> 
> > From: Atsushi Kumagai <kumagai-atsushi at mxc.nes.nec.co.jp>
> > Subject: [PATCH 01/16] [PATCH v3 1/12] Introduce cyclic mode to keep memory usage constant.
> > Date: Thu, 30 Aug 2012 16:45:21 +0900
> > 
> > <cut>
> > 
> >> diff --git a/makedumpfile.c b/makedumpfile.c
> >> index d024e95..21bb55a 100644
> >> --- a/makedumpfile.c
> >> +++ b/makedumpfile.c
> >> @@ -2553,6 +2553,8 @@ initial(void)
> >>  							info->name_memory);
> >>  			return FALSE;
> >>  		}
> >> +		info->flag_cyclic = FALSE;
> >> +
> > 
> > Please disable cyclic mode on sadump dumpfiles, too.

I will take care of sadump (and Xen) in the same way as for refiltering.

> Also, there's no information to users about disabling cyclic mode.
> Now switching from cyclic to normal mode is implicitly done. This is
> confusing. I think some message indicating that, is necessary.

As you said, it is unkind that no message is displayed.
I will show message as below when running mode is switched.

  MSG("Switched running mode from cyclic to non-cyclic,\n");
  MSG("because cyclic mode doesn't support sadump format.\n");


BTW, cyclic mode doesn't support the three below now.

 - Xen
 - refiltering
 - sadump

I will support Xen after Xen4 patch-set is merged.

On the other hand, I think the bottom two will be used in the 1st kernel
and makedumpfile can allocate enough memory, so cyclic mode isn't necessary
for them.
Therefore, I won't support them now. What do you think ?


Thanks
Atsushi Kumagai