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authorOleg Nesterov <oleg@tv-sign.ru>2006-03-28 16:11:07 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-28 18:36:41 -0800
commit73b9ebfe126a4a886ee46cbab637374d7024668a (patch)
treed7ba00d4ce76b49c1569334956cd196b35977a04 /arch/um/kernel/smp.c
parentc97d98931ac52ef110b62d9b75c6a6f2bfbc1898 (diff)
[PATCH] pidhash: don't count idle threads
fork_idle() does unhash_process() just after copy_process(). Contrary, boot_cpu's idle thread explicitely registers itself for each pid_type with nr = 0. copy_process() already checks p->pid != 0 before process_counts++, I think we can just skip attach_pid() calls and job control inits for idle threads and kill unhash_process(). We don't need to cleanup ->proc_dentry in fork_idle() because with this patch idle threads are never hashed in kernel/pid.c:pid_hash[]. We don't need to hash pid == 0 in pidmap_init(). free_pidmap() is never called with pid == 0 arg, so it will never be reused. So it is still possible to use pid == 0 in any PIDTYPE_xxx namespace from kernel/pid.c's POV. However with this patch we don't hash pid == 0 for PIDTYPE_PID case. We still have have PIDTYPE_PGID/PIDTYPE_SID entries with pid == 0: /sbin/init and kernel threads which don't call daemonize(). Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/um/kernel/smp.c')
-rw-r--r--arch/um/kernel/smp.c1
1 files changed, 0 insertions, 1 deletions
diff --git a/arch/um/kernel/smp.c b/arch/um/kernel/smp.c
index c8d8d0ac1a7..511116aebaf 100644
--- a/arch/um/kernel/smp.c
+++ b/arch/um/kernel/smp.c
@@ -143,7 +143,6 @@ void smp_prepare_cpus(unsigned int maxcpus)
idle = idle_thread(cpu);
init_idle(idle, cpu);
- unhash_process(idle);
waittime = 200000000;
while (waittime-- && !cpu_isset(cpu, cpu_callin_map))