* A question about transparent hugepages
@ 2016-08-04 4:02 zhong jiang
2016-08-04 9:16 ` Kirill A. Shutemov
0 siblings, 1 reply; 2+ messages in thread
From: zhong jiang @ 2016-08-04 4:02 UTC (permalink / raw)
To: kirill.shutemov, Mel Gorman, Michal Hocko; +Cc: LKML
according to the total_mapcount, Different process can map any subpages of the
transparent hugepages. How it can happen to ?
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: A question about transparent hugepages
2016-08-04 4:02 A question about transparent hugepages zhong jiang
@ 2016-08-04 9:16 ` Kirill A. Shutemov
0 siblings, 0 replies; 2+ messages in thread
From: Kirill A. Shutemov @ 2016-08-04 9:16 UTC (permalink / raw)
To: zhong jiang; +Cc: kirill.shutemov, Mel Gorman, Michal Hocko, LKML
On Thu, Aug 04, 2016 at 12:02:29PM +0800, zhong jiang wrote:
> according to the total_mapcount, Different process can map any subpages of the
> transparent hugepages. How it can happen to ?
For anonymous memory it can only happen over copy-on-write via fork() +
munmap() or something in one of the processes.
Now we have tmpfs/shmem with huge pages in mainline. In this case you can
map any subpage directly from file.
--
Kirill A. Shutemov
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