Alan Cox wrote:
On Iau, 2006-07-13 at 12:05 -0700, Linus Torvalds wrote:
Doing core-dumping in user space would be insane. It doesn't give _any_
advantages, only disadvantages.
It has a number of very real advantages in certain circumstances and the
only interface the kernel needs to provide is the debugger interface and
something to "kick" the debugger and reparent to it, or for that matter
it might even be viable just to pass the helper the fd of an anonymous
file holding the dump.
Taking out the kernel core dump support would be insane.
We get customers who like to collect/process/do clever stuff with core
dumps and failure cases. We also get people who want to dump a core that
excludes the 14GB shared mmap of the database file as another example
where it helps.
The in-kernel core dumper also seems to hold locks that wedge access
to /proc for that pid, which causes anything walking /proc to wedge.
For large core dumps, that takes far too long, and causes us real
problems
M.
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