[PATCH v2] makedumpfile: Exclude unnecessary hugepages.

[Petr Tesarik]

On Wed, 2 Jul 2014 16:26:54 +0800
Baoquan He <bhe at redhat.com> wrote:

> On 06/17/14 at 02:32am, Atsushi Kumagai wrote:
>  
> > +static void
> > +setup_page_is_hugepage(void)
> > +{
> > +	if (NUMBER(PG_head) != NOT_FOUND_NUMBER) {
> > +		if (NUMBER(PG_tail) == NOT_FOUND_NUMBER) {
> > +			/*
> > +			 * If PG_tail is not explicitly saved, then assume
> > +			 * that it immediately follows PG_head.
> > +			 */
> > +			NUMBER(PG_tail) = NUMBER(PG_head) + 1;
> > +		}
> > +	} else if ((NUMBER(PG_compound) != NOT_FOUND_NUMBER)
> > +		   && (info->dump_level & DL_EXCLUDE_USER_DATA)) {
> 
> Hi,
> 
> I may not understand hugepage well. I am wondering why hugepage
> filtering can't be done if PG_compound is available.

Oh, maybe I'm missing something. What do you suggest as an alternative
way to recognize a huge page if the value of PG_compound is not known?

Petr Tesarik