Date: Sun, 21 Sep 2014 15:28:38 -0400 From: suresh gumpula <gsuryacse7k@gmail.com> To: "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org> Subject: stack size rlimit Message-ID: <CAJOqHmhpjuh5em%2Bdr8Qpqu8fCsDnwC6_znSZYwc=XdM90OAVvw@mail.gmail.com>
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Hi,
I am experimenting the RLIMIT_INFINITY for RLIMIT_STACK and I observed
that we set to maximize(512M) .
Looking at kern_setrlimit() , it seems we are checking this condition and
reseting to maxssize
While reading through the "design and implementation of freebsd" book , I
came across a point that we map the shared libraries just below the stack
limit. But looking at sample map of curproc, I don't see shared libraries
just below the stack limit.
in linux , we have two different address map layouts , one is traditional
layout which maps shared libraries somewhere in the middle and the other
one which maps just below the stack limit.
And it seems by default, it prefers the flexible layout.
Can somebody please confirm freebsd layout convention. ?
This is what I see on freebsd, does not look like its starting below the
stack.
% cat /proc/curproc/map
0x400000 0x403000 3 0 0xffffff0003711d80 r-x 1 0 0x1000 COW NC vnode
/bin/cat NCH -1
0x602000 0x800000 1 0 0xffffff014816aa20 rw- 1 0 0x3000 NCOW NNC default -
CH 1002
0x800602000 0x800638000 34 0 0xffffff0003661ca8 r-x 81 40 0x1004 COW NC
vnode /libexec/ld-elf.so.1 NCH -1
0x800638000 0x800640000 7 0 0xffffff0147f2ee58 rw- 1 0 0x3000 NCOW NNC
default - CH 1002
0x800837000 0x80083b000 4 0 0xffffff0156ec0000 rw- 1 0 0x3000 COW NNC vnode
/libexec/ld-elf.so.1 CH 1002
0x80083b000 0x80084a000 5 0 0xffffff0147fa16c0 rw- 1 0 0x3000 NCOW NNC
default - CH 1002
0x80084a000 0x800984000 116 0 0xffffff00036156c0 r-x 81 40 0x1004 COW NC
vnode /lib/libc.so.7 NCH -1
0x800984000 0x800b84000 0 0 0xffffff0147f32d80 --- 1 0 0x2000 NCOW NNC
default - NCH -1
0x800b84000 0x800b8f000 11 0 0xffffff0147fb7510 rw- 1 0 0x3000 COW NNC
vnode /lib/libc.so.7 CH 1002
0x800b8f000 0x800bf4000 4 0 0xffffff01481676c0 rw- 2 0 0x3000 NCOW NNC
default - CH 1002
0x800c00000 0x800e00000 4 0 0xffffff01481676c0 rw- 2 0 0x3000 NCOW NNC
default - CH 1002
0x7ffffffe0000 0x800000000000 3 0 0xffffff0156e09000 rwx 1 0 0x3000 NCOW
NNC default - CH 1002
Thanks
Suresh
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