Hi Kirill,
On 03/18/2013 07:19 PM, Kirill A. Shutemov wrote:
Simon Jeons wrote:
On 03/18/2013 12:03 PM, Simon Jeons wrote:
Hi Kirill,
On 03/15/2013 01:50 AM, Kirill A. Shutemov wrote:
From: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Here's the second version of the patchset.
The intend of the work is get code ready to enable transparent huge page
cache for the most simple fs -- ramfs.
We have read()/write()/mmap() functionality now. Still plenty work
ahead.
One offline question.
Why set PG_mlocked to page_tail which be splited in function
__split_huge_page_refcount?
Not set, but copied from head page. Head page represents up-to-date sate
of compound page, we need to copy it to all tail pages on split.
I always see up-to-date state, could you conclude to me which state can
be treated as up-to-date? :-)
Also why can't find where _PAGE_SPLITTING and _PAGE_PSE flags are
cleared in split_huge_page path?
The pmd is invalidated and replaced with reference to page table at the end
of __split_huge_page_map.
Since pmd is populated by page table and new flag why need
invalidated(clear present flag) before it?
Another offline question:
Why don't clear tail page PG_tail flag in function
__split_huge_page_refcount?
We do:
page_tail->flags &= ~PAGE_FLAGS_CHECK_AT_PREP | __PG_HWPOISON;
Got it.
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