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authorOleg Nesterov <oleg@tv-sign.ru>2008-12-02 01:18:13 +0300
committerIngo Molnar <mingo@elte.hu>2008-12-12 19:00:07 +0300
commit27af4245b6ce99e08c6a7c38825383bf51119cc9 (patch)
tree07ab6b1da26b4d170ccaa700b2207ec1b1aff0db /include/linux/posix-timers.h
parent6c34bc2976b30dc8b56392c020e25bae1f363cab (diff)
downloadlinux-27af4245b6ce99e08c6a7c38825383bf51119cc9.tar.xz
posix-timers: use "struct pid*" instead of "struct task_struct*"
Impact: restructure, clean up code k_itimer holds the ref to the ->it_process until sys_timer_delete(). This allows to pin up to RLIMIT_SIGPENDING dead task_struct's. Change the code to use "struct pid *" instead. The patch doesn't kill ->it_process, it places ->it_pid into the union. ->it_process is still used by do_cpu_nanosleep() as before. It would be trivial to change the nanosleep code as well, but since it uses it_process in a special way I think it is better to keep this field for grep. The patch bloats the kernel by 104 bytes and it also adds the new pointer, ->it_signal, to k_itimer. It is used by lock_timer() to verify that the found timer was not created by another process. It is not clear why do we use the global database (and thus the global idr_lock) for posix timers. We still need the signal_struct->posix_timers which contains all useable timers, perhaps it is better to use some form of per-process array instead. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'include/linux/posix-timers.h')
-rw-r--r--include/linux/posix-timers.h6
1 files changed, 5 insertions, 1 deletions
diff --git a/include/linux/posix-timers.h b/include/linux/posix-timers.h
index a7c721355549..4f71bf4e628c 100644
--- a/include/linux/posix-timers.h
+++ b/include/linux/posix-timers.h
@@ -45,7 +45,11 @@ struct k_itimer {
int it_requeue_pending; /* waiting to requeue this timer */
#define REQUEUE_PENDING 1
int it_sigev_notify; /* notify word of sigevent struct */
- struct task_struct *it_process; /* process to send signal to */
+ struct signal_struct *it_signal;
+ union {
+ struct pid *it_pid; /* pid of process to send signal to */
+ struct task_struct *it_process; /* for clock_nanosleep */
+ };
struct sigqueue *sigq; /* signal queue entry. */
union {
struct {