On Wed, 18 Oct 2017 12:40:43 +0530
Anshuman Khandual <khandual@xxxxxxxxxxxxxxxxxx> wrote:
> On 10/18/2017 12:01 PM, Balbir Singh wrote:
> > With HMM, we can have either public or private zone
> > device pages. With private zone device pages, they should
> > show up as swapped entities. For public zone device pages
>
> Might be missing something here but why they should show up
> as swapped entities ? Could you please elaborate.
>
For migrated entries, my use case is to
1. malloc()/mmap() memory
2. call migrate_vma()
3. Look at smaps
It's probably not clear in the changelog.
> > the smaps output can be confusing and incomplete.
> >
> > This patch adds a new attribute to just smaps to show
> > device memory usage.
>
> If we are any way adding a new entry here then why not one
> more for private device memory pages as well. Just being
> curious.
>
Well, how do you define visibility of device private memory?
Device private is either seen as swapped out or when migrated
back is visible as a part of the mm. Am I missing anything?
> >
> > Signed-off-by: Balbir Singh <bsingharora@xxxxxxxxx>
> > ---
> > fs/proc/task_mmu.c | 17 +++++++++++++++--
> > 1 file changed, 15 insertions(+), 2 deletions(-)
> >
> > diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
> > index 9f1e2b2b5f5a..b7f32f42ee93 100644
> > --- a/fs/proc/task_mmu.c
> > +++ b/fs/proc/task_mmu.c
> > @@ -451,6 +451,7 @@ struct mem_size_stats {
> > unsigned long shared_hugetlb;
> > unsigned long private_hugetlb;
> > unsigned long first_vma_start;
> > + unsigned long device_memory;
> > u64 pss;
> > u64 pss_locked;
> > u64 swap_pss;
> > @@ -463,12 +464,22 @@ static void smaps_account(struct mem_size_stats *mss, struct page *page,
> > int i, nr = compound ? 1 << compound_order(page) : 1;
> > unsigned long size = nr * PAGE_SIZE;
> >
> > + /*
> > + * We don't want to process public zone device pages further
> > + * than just showing how much device memory we have
> > + */
> > + if (is_zone_device_page(page)) {
>
> Should not this contain both public and private device pages.
>
This page is received from _vm_normal_page(.., true), I don't
think device private pages show up here.
> > + mss->device_memory += size;
> > + return;
> > + }
> > +
> > if (PageAnon(page)) {
> > mss->anonymous += size;
> > if (!PageSwapBacked(page) && !dirty && !PageDirty(page))
> > mss->lazyfree += size;
> > }
> >
> > +
>
> Stray new line.
>
I can remove it
> > mss->resident += size;
> > /* Accumulate the size in pages that have been accessed. */
> > if (young || page_is_young(page) || PageReferenced(page))
> > @@ -833,7 +844,8 @@ static int show_smap(struct seq_file *m, void *v, int is_pid)
> > "Private_Hugetlb: %7lu kB\n"
> > "Swap: %8lu kB\n"
> > "SwapPss: %8lu kB\n"
> > - "Locked: %8lu kB\n",
> > + "Locked: %8lu kB\n"
>
> Stray changed line.
?? The line has changed
Thanks for the review!
Balbir Singh.
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