linux-kernel - [PATCH] tools/vm/page-types: remove dependency on opt

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Date:   Fri, 17 Sep 2021 11:28:26 +0800
From:   Changbin Du <changbin.du@...il.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Changbin Du <changbin.du@...il.com>
Subject: [PATCH] tools/vm/page-types: remove dependency on opt_file for idle page tracking

Idle page tracking can also be used for process address space, not only
file mappings.

Without this change, using with '-i' option for process address space
encounters below errors reported.

$ sudo ./page-types -p $(pidof bash) -i
mark page idle: Bad file descriptor
mark page idle: Bad file descriptor
mark page idle: Bad file descriptor
mark page idle: Bad file descriptor
mark page idle: Bad file descriptor
mark page idle: Bad file descriptor
....

Signed-off-by: Changbin Du <changbin.du@...il.com>
---
 tools/vm/page-types.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/vm/page-types.c b/tools/vm/page-types.c
index 0517c744b04e..f62f10c988db 100644
--- a/tools/vm/page-types.c
+++ b/tools/vm/page-types.c
@@ -1331,7 +1331,7 @@ int main(int argc, char *argv[])
 	if (opt_list && opt_list_mapcnt)
 		kpagecount_fd = checked_open(PROC_KPAGECOUNT, O_RDONLY);

-	if (opt_mark_idle && opt_file)
+	if (opt_mark_idle)
 		page_idle_fd = checked_open(SYS_KERNEL_MM_PAGE_IDLE, O_RDWR);

 	if (opt_list && opt_pid)
-- 
2.32.0