On 20/08/15 09:26, Naoya Horiguchi wrote:
> Currently /proc/PID/smaps provides no usage info for vma(VM_HUGETLB), which
> is inconvenient when we want to know per-task or per-vma base hugetlb usage.
> To solve this, this patch adds a new line for hugetlb usage like below:
>
> Size: 20480 kB
> Rss: 0 kB
> Pss: 0 kB
> Shared_Clean: 0 kB
> Shared_Dirty: 0 kB
> Private_Clean: 0 kB
> Private_Dirty: 0 kB
> Referenced: 0 kB
> Anonymous: 0 kB
> AnonHugePages: 0 kB
> HugetlbPages: 18432 kB
> Swap: 0 kB
> KernelPageSize: 2048 kB
> MMUPageSize: 2048 kB
> Locked: 0 kB
> VmFlags: rd wr mr mw me de ht
>
> Signed-off-by: Naoya Horiguchi <[email protected]>
> Acked-by: Joern Engel <[email protected]>
> Acked-by: David Rientjes <[email protected]>
> ---
> v3 -> v4:
> - suspend Acked-by tag because v3->v4 change is not trivial
> - I stated in previous discussion that HugetlbPages line can contain page
> size info, but that's not necessary because we already have KernelPageSize
> info.
> - merged documentation update, where the current documentation doesn't mention
> AnonHugePages, so it's also added.
> ---
> Documentation/filesystems/proc.txt | 7 +++++--
> fs/proc/task_mmu.c | 29 +++++++++++++++++++++++++++++
> 2 files changed, 34 insertions(+), 2 deletions(-)
>
> diff --git v4.2-rc4/Documentation/filesystems/proc.txt
> v4.2-rc4_patched/Documentation/filesystems/proc.txt
> index 6f7fafde0884..22e40211ef64 100644
> --- v4.2-rc4/Documentation/filesystems/proc.txt
> +++ v4.2-rc4_patched/Documentation/filesystems/proc.txt
> @@ -423,6 +423,8 @@ Private_Clean: 0 kB
> Private_Dirty: 0 kB
> Referenced: 892 kB
> Anonymous: 0 kB
> +AnonHugePages: 0 kB
> +HugetlbPages: 0 kB
> Swap: 0 kB
> KernelPageSize: 4 kB
> MMUPageSize: 4 kB
> @@ -440,8 +442,9 @@ indicates the amount of memory currently marked as
> referenced or accessed.
> "Anonymous" shows the amount of memory that does not belong to any file.
> Even
> a mapping associated with a file may contain anonymous pages: when
> MAP_PRIVATE
> and a page is modified, the file page is replaced by a private anonymous
> copy.
> -"Swap" shows how much would-be-anonymous memory is also used, but out on
> -swap.
> +"AnonHugePages" shows the ammount of memory backed by transparent hugepage.
> +"HugetlbPages" shows the ammount of memory backed by hugetlbfs page.
> +"Swap" shows how much would-be-anonymous memory is also used, but out on
> swap.
There is no distinction between "private" and "shared" in this "huge page"
accounting right?
Would it be possible to account for the huge pages in the
{Private,Shared}_{Clean,Dirty} fields?
Or otherwise split the huge page accounting into shared/private?
thanks!
Pádraig.
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