Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
seqlock: Change do_io_accounting() 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
795aab35
b76f72be
+3
-10
+3
-10
fs/proc/base.c
+3
-10
fs/proc/base.c
···
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3043
if (whole) {
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struct signal_struct *sig = task->signal;
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struct task_struct *t;
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-
unsigned int seq = 1;
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-
unsigned long flags;
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-
rcu_read_lock();
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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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-
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+
guard(rcu)();
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+
scoped_seqlock_read (&sig->stats_lock, ss_lock_irqsave) {
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acct = sig->ioac;
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__for_each_thread(sig, t)
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task_io_accounting_add(&acct, &t->ioac);
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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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-
rcu_read_unlock();
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+
}
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} else {
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acct = task->ioac;
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}