git: kernel - Make most of the fork and exit paths MPSAFE
commit b5c4d81fee4abb297f1e3c6e6514c4bfc3c68bc0
Author: Matthew Dillon <dillon@apollo.backplane.com>
Date: Sat Feb 12 14:20:09 2011 -0800
kernel - Make most of the fork and exit paths MPSAFE
* Remove the MP lock from numerous system calls (mainly socket calls) that
no longer need it.
* Use proc_token in a couple of places that still need work (instead of
the MP lock). For example, the process group (pgrp) and several places
which call pfind() still need to use the proc_token.
* Use the per-process p->p_token in fork1(), exit1(), and lwp_exit().
The critical portions of these paths now have significant concurrency.
* Use the per-process p->p_token when traversing p->p_children, primarily
aiding the kern_wait() code. So the wait*() system calls should now
have significant concurrency.
* Change the fgetown() API to avoid certain races.
* Add M_ZERO to the struct filedesc_to_leader allocation for safety
purposes.
Summary of changes:
sys/dev/drm/drm_drv.c | 2 +-
sys/kern/kern_descrip.c | 81 +++++++++++++++++++++------------
sys/kern/kern_exit.c | 67 +++++++++++++++++-----------
sys/kern/kern_fork.c | 40 ++++++++++-------
sys/kern/kern_ktrace.c | 47 ++++++++++++--------
sys/kern/kern_proc.c | 10 +++-
sys/kern/kern_sig.c | 2 +
sys/kern/subr_log.c | 4 +-
sys/kern/sys_pipe.c | 10 +---
sys/kern/sys_socket.c | 27 +++--------
sys/kern/tty.c | 2 +-
sys/kern/uipc_syscalls.c | 60 ++-----------------------
sys/net/bpf.c | 4 +-
sys/net/tap/if_tap.c | 4 +-
sys/net/tun/if_tun.c | 4 +-
sys/platform/pc32/i386/trap.c | 4 +-
sys/platform/pc64/x86_64/trap.c | 4 +-
sys/platform/vkernel/i386/trap.c | 4 +-
sys/platform/vkernel64/x86_64/trap.c | 4 +-
sys/sys/filedesc.h | 2 +-
20 files changed, 187 insertions(+), 195 deletions(-)
http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/b5c4d81fee4abb297f1e3c6e6514c4bfc3c68bc0
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