Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
seqlock: Change do_task_stat() to use scoped_seqlock_read()
To simplify the code and make it more readable.
[peterz: change to new interface]
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
authored by
Oleg Nesterov
and committed by
Peter Zijlstra
b76f72be
488f48b3
+2
-7
+2
-7
fs/proc/array.c
+2
-7
fs/proc/array.c
···
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unsigned long flags;
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int exit_code = task->exit_code;
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struct signal_struct *sig = task->signal;
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-
unsigned int seq = 1;
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state = *get_task_state(task);
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vsize = eip = esp = 0;
···
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if (permitted && (!whole || num_threads < 2))
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wchan = !task_is_running(task);
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-
do {
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-
seq++; /* 2 on the 1st/lockless path, otherwise odd */
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-
flags = read_seqbegin_or_lock_irqsave(&sig->stats_lock, &seq);
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-
541
+
scoped_seqlock_read (&sig->stats_lock, ss_lock_irqsave) {
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cmin_flt = sig->cmin_flt;
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cmaj_flt = sig->cmaj_flt;
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cutime = sig->cutime;
···
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}
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rcu_read_unlock();
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}
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-
} while (need_seqretry(&sig->stats_lock, seq));
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-
done_seqretry_irqrestore(&sig->stats_lock, seq, flags);
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+
}
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if (whole) {
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thread_group_cputime_adjusted(task, &utime, &stime);