On Saturday, 6 April 2019 2:57 AM, Valdis Klētnieks
wrote:
On Fri, 05 Apr 2019 10:54:47 -, Pankaj Suryawanshi said:
> I have PFN of all processes in user space, how to calculate page address to
> PFN.
*All* user processes? That's going to be a lot of PFN's. What problem are you
trying
to solve here?
I am trying to solve problem with cma allocation failure, and try to find
process who pinned the pages from cma reserved area.
When cma allocation failed it dumped the information and it contains flags and
page address, before failing i have information/PFN of processes who aquires
pages from cma area.
Now i want to find exact PFN of the dumped pages who is responsible for
allocation failure.
Note: I have got the pfn from /tools/vm/page-types.c in user space and i have
start pfn of cma reserved area, so i filter the cma area pfn.
(Hint - under what cases does the kernel care about the PFN of *any* user page?)
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