Date: Sun, 31 Jul 2005 23:45:19 +0530 From: Joseph Koshy <joseph.koshy@gmail.com> To: Giorgos Keramidas <keramida@ceid.upatras.gr> Cc: freebsd-current@freebsd.org Subject: Re: mmap bug? Message-ID: <84dead720507311115290f0140@mail.gmail.com> In-Reply-To: <20050731160853.GC49839@gothmog.gr> References: <20050731141801.GA49300@gothmog.gr> <84dead7205073108564f71f1ab@mail.gmail.com> <20050731160853.GC49839@gothmog.gr>
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gk> That's something I didn't test. No, the 'extra' data=20
gk> disappears.
So the 'extra' data isn't reaching the FS and is probably
being served up from a cached VM data the second time your
test program ran.
This is still a bug though: the mmap(2) manual page
says:
...
If len is not a multiple of
the page-size, the mapped region may extend past the=20
specified range. Any such extension beyond the end of the=20
mapped object will be zero-filled.
...
We are clearly not doing the zero-filling.
--=20
FreeBSD Volunteer, http://people.freebsd.org/~jkoshy
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