On Wed, 7 Nov 2012, Kirill A. Shutemov wrote: > From: "Kirill A. Shutemov" <[email protected]> > > Huge zero page (hzp) is a non-movable huge page (2M on x86-64) filled > with zeros. > > For now let's allocate the page on hugepage_init(). We'll switch to lazy > allocation later. > > We are not going to map the huge zero page until we can handle it > properly on all code paths. > > is_huge_zero_{pfn,pmd}() functions will be used by following patches to > check whether the pfn/pmd is huge zero page. > > Signed-off-by: Kirill A. Shutemov <[email protected]>
Acked-by: David Rientjes <[email protected]> > --- > mm/huge_memory.c | 30 ++++++++++++++++++++++++++++++ > 1 files changed, 30 insertions(+), 0 deletions(-) > > diff --git a/mm/huge_memory.c b/mm/huge_memory.c > index 40f17c3..e5ce979 100644 > --- a/mm/huge_memory.c > +++ b/mm/huge_memory.c > @@ -47,6 +47,7 @@ static unsigned int khugepaged_scan_sleep_millisecs > __read_mostly = 10000; > /* during fragmentation poll the hugepage allocator once every minute */ > static unsigned int khugepaged_alloc_sleep_millisecs __read_mostly = 60000; > static struct task_struct *khugepaged_thread __read_mostly; > +static unsigned long huge_zero_pfn __read_mostly; > static DEFINE_MUTEX(khugepaged_mutex); > static DEFINE_SPINLOCK(khugepaged_mm_lock); > static DECLARE_WAIT_QUEUE_HEAD(khugepaged_wait); > @@ -159,6 +160,29 @@ static int start_khugepaged(void) > return err; > } > > +static int init_huge_zero_page(void) Could be __init, but this gets switched over to lazy allocation later in the series so probably not worth it. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
