linux-kernel - [PATCH -next 2/3] ftrace: Optimize the allocation for mcount entries

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Message-ID: <20221109094434.84046-3-wangwensheng4@huawei.com>
Date:   Wed, 9 Nov 2022 09:44:33 +0000
From:   Wang Wensheng <wangwensheng4@...wei.com>
To:     <linux-kernel@...r.kernel.org>, <rostedt@...dmis.org>,
        <mhiramat@...nel.org>, <mark.rutland@....com>
CC:     <xuqiang36@...wei.com>, <weiyongjun1@...wei.com>,
        <wangwensheng4@...wei.com>
Subject: [PATCH -next 2/3] ftrace: Optimize the allocation for mcount entries

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.

Signed-off-by: Wang Wensheng <wangwensheng4@...wei.com>
---
 kernel/trace/ftrace.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index c571c2813c11..43a958b28022 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -3200,7 +3200,7 @@ 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;
 	}
 
-- 
2.17.1