From: HATAYAMA Daisuke <d.hatayama@xxxxxxxxxxxxxx> Subject: [RFC PATCH 00/10] Support free page filtering looking up mem_map array Date: Fri, 29 Jun 2012 02:37:57 +0900 > This new free page filtering needs the following values. > > - OFFSET(page._mapcount) > - OFFSET(page.private) > - SIZE(pageflags) > - NUMBER(PG_buddy) > - NUMBER(PG_slab) > - NUMBER(PAGE_BUDDY_MAPCOUNT_VALUE) > > Unfortunately, OFFSET(_mapcount) and OFFSET(private) fields of page > structure cannot be obtained from VMLINUX using the exiting library in > makedumpfile since two members are anonymous components of union > types. We need a new interface for them. > > To try to use this patch set, it's handy to pass manually editted > VMCOREINFO file via -i option. > Concretely, I added the following values in VMCOREINFO generated with -g option or using strings command directly to vmcore. * 3.1.0-7.fc16.x86_64 NUMBER(PG_slab)=7 SIZE(pageflags)=4 OFFSET(page._mapcount)=24 OFFSET(page.private)=48 NUMBER(PAGE_BUDDY_MAPCOUNT_VALUE)=-128 * 2.6.38 SIZE(pageflags)=4 OFFSET(page._mapcount)=12 OFFSET(page.private)=16 NUMBER(PG_slab)=7 NUMBER(PAGE_BUDDY_MAPCOUNT_VALUE)=-2 * 2.6.32 NUMBER(PG_slab)=7 NUMBER(PG_buddy)=19 OFFSET(page._mapcount)=12 OFFSET(page.private)=16 SIZE(pageflags)=4 * 2.6.18 NUMBER(PG_slab)=7 NUMBER(PG_buddy)=19 OFFSET(page._mapcount)=12 OFFSET(page.private)=16 Thanks. HATAYAMA, Daisuke
