Messages in this thread | | | Date | Tue, 30 Sep 2008 21:17:04 +0900 | From | Hidehiro Kawai <> | Subject | Re: [PATCH 1/2] coredump_filter: add hugepage dumping v3 |
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Hi Kosaki-san,
KOSAKI Motohiro wrote: > Index: b/Documentation/filesystems/proc.txt > =================================================================== > --- a/Documentation/filesystems/proc.txt 2008-09-25 21:19:13.000000000 +0900 > +++ b/Documentation/filesystems/proc.txt 2008-09-25 21:21:05.000000000 +0900 > @@ -2408,24 +2408,29 @@ will be dumped when the <pid> process is > of memory types. If a bit of the bitmask is set, memory segments of the > corresponding memory type are dumped, otherwise they are not dumped. > > -The following 4 memory types are supported: > +The following 7 memory types are supported: > - (bit 0) anonymous private memory > - (bit 1) anonymous shared memory > - (bit 2) file-backed private memory > - (bit 3) file-backed shared memory > - (bit 4) ELF header pages in file-backed private memory areas (it is > effective only if the bit 2 is cleared) > + - (bit 5) hugetlb private memory > + - (bit 6) hugetlb shared memory > > Note that MMIO pages such as frame buffer are never dumped and vDSO pages > are always dumped regardless of the bitmask status. > > -Default value of coredump_filter is 0x3; this means all anonymous memory > -segments are dumped. > + Note bit 0-4 doesn't effect any hugetlb memory. hugetlb memory are only > + effected by bit 5-6. > + > +Default value of coredump_filter is 0x23; this means all anonymous memory > +segments and hugetlb private memory are dumped. > > If you don't want to dump all shared memory segments attached to pid 1234, > -write 1 to the process's proc file. > +write 21 to the process's proc file.
This should be: write 0x21 to the process's proc file.
Except for this, it seems OK. Thanks.
Reviewed-by: Hidehiro Kawai <hidehiro.kawai.ez@hitachi.com>
> - $ echo 0x1 > /proc/1234/coredump_filter > + $ echo 0x21 > /proc/1234/coredump_filter > > When a new process is created, the process inherits the bitmask status from its > parent. It is useful to set up coredump_filter before the program runs.
-- Hidehiro Kawai Hitachi, Systems Development Laboratory Linux Technology Center
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