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Date: Thu, 10 Feb 2022 18:00:59 +0800 From: Zhaoyang Huang <huangzhaoyang@...il.com> To: Andrew Morton <akpm@...ux-foundation.org>, Zhaoyang Huang <zhaoyang.huang@...soc.com>, "open list:MEMORY MANAGEMENT" <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org> Subject: Re: [RFC PATCH] mm: record context on page->mapping There are some places to modify as 'free_pages_check' for the formal version, just RFC here to see if it is doable? On Thu, Feb 10, 2022 at 5:02 PM Huangzhaoyang <huangzhaoyang@...il.com> wrote: > > From: Zhaoyang Huang <zhaoyang.huang@...soc.com> > > Since page->mapping is vacant in the pages which used by kernel(drivers etc) > Have it record current context to help tracking the page's owner in system > memory dump. > > Signed-off-by: Zhaoyang Huang <zhaoyang.huang@...soc.com> > --- > mm/page_alloc.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/mm/page_alloc.c b/mm/page_alloc.c > index c595274..2757d10 100644 > --- a/mm/page_alloc.c > +++ b/mm/page_alloc.c > @@ -2430,6 +2430,8 @@ static void prep_new_page(struct page *page, unsigned int order, gfp_t gfp_flags > set_page_pfmemalloc(page); > else > clear_page_pfmemalloc(page); > + > + page->mapping = (struct address_space *)current; > } > > /* > -- > 1.9.1 >
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