* COW page cache for file hole?
@ 2011-05-04 2:45 Dave Young
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From: Dave Young @ 2011-05-04 2:45 UTC (permalink / raw)
To: Linux Kernel Mailing List, linux-mm, linux-fsdevel, Wu Fengguang
Hi,
During test fengguang's readahead alloc-noretry patch, I have some thoughts
In the 1000 dd case, page cache of sparse file hole are all zero indeed.
So what about make a global zero page for that purpose, fs level know
it is a hole,
when write occurs on that page we can alloc a new page for that.
I have no enough knowledge to implement it so just give out the
question without patch, sorry.
BTW, was there any attempt for this before?
--
Regards
dave
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2011-05-04 2:45 COW page cache for file hole? Dave Young
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