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smp: Reduce logging due to dump_stack of CSD waiters

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If a waiter is waiting for CSD lock, its call stack will not change
between first and subsequent hang detection for the same CSD lock.
Therefore, do dump_stack only for first-time detection for a given waiter.

This avoids excessive logging on systems with hundreds of CPUs where
repetitive dump_stack from hundreds of CPUs would otherwise flood the
console.

Signed-off-by: Imran Khan <imran.f.khan@oracle.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Juergen Gross <jgross@suse.com>
Cc: Valentin Schneider <vschneid@redhat.com>
Cc: Yury Norov <yury.norov@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Imran Khan 2023-05-09 08:31:23 +10:00 committed by Paul E. McKenney
parent 06c2afb862
commit 5bd00f6db0
1 changed files with 2 additions and 1 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

3
kernel/smp.c
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@ -259,7 +259,8 @@ static bool csd_lock_wait_toolong(struct __call_single_data *csd, u64 ts0, u64 *
arch_send_call_function_single_ipi(cpu); arch_send_call_function_single_ipi(cpu);
} }
} }
dump_stack(); if (firsttime)
dump_stack();
*ts1 = ts2; *ts1 = ts2;
return false; return false;