Commit c50e0bcf authored Nov 09, 2022 by Wang Wensheng Committed by Greg Kroah-Hartman Nov 25, 2022

ftrace: Optimize the allocation for mcount entries

commit bcea02b096333dc74af987cb9685a4dbdd820840 upstream.

If we can't allocate this size, try something smaller with half of the
size. Its order should be decreased by one instead of divided by two.

Link: https://lkml.kernel.org/r/20221109094434.84046-3-wangwensheng4@huawei.com



Cc: <mhiramat@kernel.org>
Cc: <mark.rutland@arm.com>
Cc: stable@vger.kernel.org
Fixes: a7900875 ("ftrace: Allocate the mcount record pages as groups")
Signed-off-by: Wang Wensheng <wangwensheng4@huawei.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent 3041feee

kernel/trace/ftrace.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -3017,7 +3017,7 @@ static int ftrace_allocate_records(struct ftrace_page *pg, int count)
		/* if we can't allocate this size, try something smaller */
		if (!order)
		return -ENOMEM;
		order >>= 1;
		order--;
		goto again;
		}