On Tue, Apr 22, 2014 at 11:57:50AM -0700, Linus Torvalds wrote:
> Are you testing anything new? Or is this strictly new to 3.15? The
> only thing in this area we do differently is commit cda540ace6a1 ("mm:
> get_user_pages(write,force) refuse to COW in shared areas"), but
> fault_in_user_writeable() never used the force bit afaik. Adding Hugh
> just in case.
You mean new as in additions to trinity ?
The only recent chance that might be relevant is that now, when I create
struct iovec's to pass to syscalls, I populate them solely with results
from mmap's rather than a mix of mmaps and mallocs. The mmaps could be
all kinds of sizes, types etc. [*] So now there's more chance I guess
that an iovec contains a bunch of hugepages, or read-only pages etc.
I took another slightly longer trace of what's going on at
http://codemonkey.org.uk/junk/trace2.out
But it looks to me to be pretty similar.
Dave
[*] https://github.com/kernelslacker/trinity/commit/1e73841971717256089d63e9f7fc33972d48028c
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