Re: [PATCH RFC 3/6] kexec: export PG_offline to VMCOREINFO
From: Dave Young <hidden>
Date: 2018-11-15 06:19:23
Also in:
linux-fsdevel, linux-mm, linux-pm, lkml
Hi David, On 11/14/18 at 10:17pm, David Hildenbrand wrote:
Let's export PG_offline via PAGE_OFFLINE_MAPCOUNT_VALUE, so makedumpfile can directly skip pages that are logically offline and the content therefore stale.
It would be good to copy some background info from cover letter to the patch description so that we can get better understanding why this is needed now. BTW, Lianbo is working on a documentation of the vmcoreinfo exported fields. Ccing him so that he is aware of this. Also cc Boris, although I do not want the doc changes blocks this he might have different opinion :)
quoted hunk ↗ jump to hunk
Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Dave Young <redacted> Cc: "Kirill A. Shutemov" <redacted> Cc: Baoquan He <redacted> Cc: Omar Sandoval <redacted> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Matthew Wilcox <willy@infradead.org> Cc: Michal Hocko <mhocko@suse.com> Cc: "Michael S. Tsirkin" <mst@redhat.com> Signed-off-by: David Hildenbrand <redacted> --- kernel/crash_core.c | 2 ++ 1 file changed, 2 insertions(+)diff --git a/kernel/crash_core.c b/kernel/crash_core.c index 933cb3e45b98..093c9f917ed0 100644 --- a/kernel/crash_core.c +++ b/kernel/crash_core.c@@ -464,6 +464,8 @@ static int __init crash_save_vmcoreinfo_init(void) VMCOREINFO_NUMBER(PAGE_BUDDY_MAPCOUNT_VALUE); #ifdef CONFIG_HUGETLB_PAGE VMCOREINFO_NUMBER(HUGETLB_PAGE_DTOR); +#define PAGE_OFFLINE_MAPCOUNT_VALUE (~PG_offline) + VMCOREINFO_NUMBER(PAGE_OFFLINE_MAPCOUNT_VALUE); #endif arch_crash_save_vmcoreinfo();-- 2.17.2
Thanks Dave