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ftrace: Add cond_resched() to ftrace_graph_set_hash()

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commit 42ea22e754ba4f2b86f8760ca27f6f71da2d982c upstream.

When the kernel contains a large number of functions that can be traced,
the loop in ftrace_graph_set_hash() may take a lot of time to execute.
This may trigger the softlockup watchdog.

Add cond_resched() within the loop to allow the kernel to remain
responsive even when processing a large number of functions.

This matches the cond_resched() that is used in other locations of the
code that iterates over all functions that can be traced.

Cc: stable@vger.kernel.org
Fixes: b9b0c831be ("ftrace: Convert graph filter to use hash tables")
Link: https://lore.kernel.org/tencent_3E06CE338692017B5809534B9C5C03DA7705@qq.com
Signed-off-by: zhoumin <teczm@foxmail.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
zhoumin
2025-04-01 01:00:34 +08:00
committed by Greg Kroah-Hartman
parent 3e467f1c74
commit 1fce9574b9
1 changed files with 1 additions and 0 deletions
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kernel/trace/ftrace.c
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@@ -6848,6 +6848,7 @@ ftrace_graph_set_hash(struct ftrace_hash *hash, char *buffer)
}
}
}
cond_resched();
} while_for_each_ftrace_rec();
out:
mutex_unlock(&ftrace_lock);