ftrace: Add cond_resched() to ftrace_graph_set_hash()
authorzhoumin <teczm@foxmail.com>
Mon, 31 Mar 2025 17:00:34 +0000 (01:00 +0800)
committerSteven Rostedt (Google) <rostedt@goodmis.org>
Wed, 2 Apr 2025 13:51:25 +0000 (09:51 -0400)
commit42ea22e754ba4f2b86f8760ca27f6f71da2d982c
tree8710fc517e702c8ff127a25788f8e23e50f8231d
parent2c9ee74a6d6166d0f31f00841cde16a2915fffcb
ftrace: Add cond_resched() to ftrace_graph_set_hash()

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: b9b0c831bed26 ("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>
kernel/trace/ftrace.c