* How to calculate page address to PFN in user space.
[not found] <1536252828.16026118.1554461687939.ref@mail.yahoo.com>
@ 2019-04-05 10:54 ` Pankaj Suryawanshi
2019-04-05 21:27 ` Valdis Klētnieks
0 siblings, 1 reply; 3+ messages in thread
From: Pankaj Suryawanshi @ 2019-04-05 10:54 UTC (permalink / raw)
To: LKML, linux-mm, kernelnewbies
Hello,
I have PFN of all processes in user space, how to calculate page address to PFN.
eg .
page address :bf05febc in kernel space.
I have PFN no for user space processes as below.
8a81b
69da0
88cf4
88d06
88d07
9549f
952d0
9734a
87c7d
87ca0
How to calculate/match page address to PFN ?
Regards,
Pankaj
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* Re: How to calculate page address to PFN in user space.
2019-04-05 10:54 ` How to calculate page address to PFN in user space Pankaj Suryawanshi
@ 2019-04-05 21:27 ` Valdis Klētnieks
2019-04-06 6:15 ` Pankaj Suryawanshi
0 siblings, 1 reply; 3+ messages in thread
From: Valdis Klētnieks @ 2019-04-05 21:27 UTC (permalink / raw)
To: Pankaj Suryawanshi; +Cc: linux-mm, LKML, kernelnewbies
On Fri, 05 Apr 2019 10:54:47 -0000, 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?
(Hint - under what cases does the kernel care about the PFN of *any* user page?)
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* Re: How to calculate page address to PFN in user space.
2019-04-05 21:27 ` Valdis Klētnieks
@ 2019-04-06 6:15 ` Pankaj Suryawanshi
0 siblings, 0 replies; 3+ messages in thread
From: Pankaj Suryawanshi @ 2019-04-06 6:15 UTC (permalink / raw)
To: Valdis Klētnieks; +Cc: linux-mm, LKML, kernelnewbies
On Saturday, 6 April 2019 2:57 AM, Valdis Klētnieks <valdis.kletnieks@vt.edu> wrote:
On Fri, 05 Apr 2019 10:54:47 -0000, 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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2019-04-05 10:54 ` How to calculate page address to PFN in user space Pankaj Suryawanshi
2019-04-05 21:27 ` Valdis Klētnieks
2019-04-06 6:15 ` Pankaj Suryawanshi
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