linux-kernel - Re: [PATCH] tools/vm/page-types.c: add memory cgroup dumping and filtering

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Date:	Tue, 9 Feb 2016 18:11:35 +0300
From:	Vladimir Davydov <vdavydov@...tuozzo.com>
To:	Konstantin Khlebnikov <koct9i@...il.com>
CC:	<linux-mm@...ck.org>, Andrew Morton <akpm@...ux-foundation.org>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] tools/vm/page-types.c: add memory cgroup dumping and
 filtering

On Sat, Feb 06, 2016 at 01:06:29PM +0300, Konstantin Khlebnikov wrote:
...
>  static int		opt_list;	/* list pages (in ranges) */
>  static int		opt_no_summary;	/* don't show summary */
>  static pid_t		opt_pid;	/* process to walk */
> -const char *		opt_file;
> +const char *		opt_file;	/* file or directory path */
> +static int64_t		opt_cgroup = -1;/* cgroup inode */

ino should be a positive number, so we could use uint64_t here. Of
course, ino=0 could be used for filtering pages not charged to any
cgroup (as it is in this patch), but I doubt this would be useful.

Also, this patch conflicts with the recent change by Naoya introducing
support of dumping swap entries - https://lkml.org/lkml/2016/2/4/50

I attached a fixlet that addresses these two issues. What do you think
about it?

Other than that the patch looks good to me,

Reviewed-by: Vladimir Davydov <vdavydov@...tuozzo.com>

Thanks,
Vladimir

---
diff --git a/tools/vm/page-types.c b/tools/vm/page-types.c
index a85c5e7a98ed..dab61c377f54 100644
--- a/tools/vm/page-types.c
+++ b/tools/vm/page-types.c
@@ -170,7 +170,7 @@ static int		opt_list;	/* list pages (in ranges) */
 static int		opt_no_summary;	/* don't show summary */
 static pid_t		opt_pid;	/* process to walk */
 const char *		opt_file;	/* file or directory path */
-static int64_t		opt_cgroup = -1;/* cgroup inode */
+static uint64_t		opt_cgroup;	/* cgroup inode */
 static int		opt_list_cgroup;/* list page cgroup */
 
 #define MAX_ADDR_RANGES	1024
@@ -604,7 +604,7 @@ static void add_page(unsigned long voffset, unsigned long offset,
 	if (!bit_mask_ok(flags))
 		return;
 
-	if (opt_cgroup >= 0 && cgroup != (uint64_t)opt_cgroup)
+	if (opt_cgroup && cgroup != (uint64_t)opt_cgroup)
 		return;
 
 	if (opt_hwpoison)
@@ -659,10 +659,13 @@ static void walk_swap(unsigned long voffset, uint64_t pme)
 	if (!bit_mask_ok(flags))
 		return;
 
+	if (opt_cgroup)
+		return;
+
 	if (opt_list == 1)
-		show_page_range(voffset, pagemap_swap_offset(pme), 1, flags);
+		show_page_range(voffset, pagemap_swap_offset(pme), 1, flags, 0);
 	else if (opt_list == 2)
-		show_page(voffset, pagemap_swap_offset(pme), flags);
+		show_page(voffset, pagemap_swap_offset(pme), flags, 0);
 
 	nr_pages[hash_slot(flags)]++;
 	total_pages++;
@@ -1240,7 +1243,7 @@ int main(int argc, char *argv[])
 		}
 	}
 
-	if (opt_cgroup >= 0 || opt_list_cgroup)
+	if (opt_cgroup || opt_list_cgroup)
 		kpagecgroup_fd = checked_open(PROC_KPAGECGROUP, O_RDONLY);
 
 	if (opt_list && opt_pid)