On Thu, Aug 20, 2015 at 12:49:29PM +0200, Michal Hocko wrote: > On Thu 20-08-15 08:26:26, 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 > > I have only now got to this thread. This is indeed very helpful. I would > just suggest to update Documentation/filesystems/proc.txt to be explicit > that Rss: doesn't count hugetlb pages for historical reasons.
I agree, I want the following diff to be folded to this patch. > > > Signed-off-by: Naoya Horiguchi <[email protected]> > > Acked-by: Joern Engel <[email protected]> > > Acked-by: David Rientjes <[email protected]> > > Acked-by: Michal Hocko <[email protected]> Thank you. Naoya Horiguchi --- From: Naoya Horiguchi <[email protected]> Date: Fri, 21 Aug 2015 08:13:31 +0900 Subject: [PATCH] Documentation/filesystems/proc.txt: give additional comment about hugetlb usage --- Documentation/filesystems/proc.txt | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/Documentation/filesystems/proc.txt b/Documentation/filesystems/proc.txt index f561fc46e41b..b775b6faaeda 100644 --- a/Documentation/filesystems/proc.txt +++ b/Documentation/filesystems/proc.txt @@ -446,7 +446,8 @@ indicates the amount of memory currently marked as referenced or accessed. 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. "AnonHugePages" shows the ammount of memory backed by transparent hugepage. -"HugetlbPages" shows the ammount of memory backed by hugetlbfs page. +"HugetlbPages" shows the ammount of memory backed by hugetlbfs page (which is +not counted in "Rss" or "Pss" field for historical reasons.) "Swap" shows how much would-be-anonymous memory is also used, but out on swap. "VmFlags" field deserves a separate description. This member represents the kernel -- 2.4.3
