[RFC,v2,12/19] mm: expose ksm process profit metric in ksm_stat

Commit Message

Stefan Roesch Feb. 10, 2023, 9:50 p.m. UTC

This exposes the ksm process profit metric in /proc/<pid>/ksm_stat.
The documentation mentions the formula for the ksm process profit
metric, however it does not calculate it. In addition the formula
depends on the size of internal structures. So it makes sense to expose
it.

Signed-off-by: Stefan Roesch <[e-mail]>
---
 fs/proc/base.c | 3 +++
 1 file changed, 3 insertions(+)

Patch

diff --git a/fs/proc/base.c b/fs/proc/base.c
index ac9ebe972be0..fb9567bc42a4 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -96,6 +96,7 @@ 
 #include <linux/time_namespace.h>
 #include <linux/resctrl.h>
 #include <linux/cn_proc.h>
+#include <linux/ksm.h>
 #include <trace/events/oom.h>
 #include "internal.h"
 #include "fd.h"
@@ -3208,6 +3209,8 @@  static int proc_pid_ksm_stat(struct seq_file *m, struct pid_namespace *ns,
 	if (mm) {
 		seq_printf(m, "ksm_rmap_items %lu\n", mm->ksm_rmap_items);
 		seq_printf(m, "zero_pages_sharing %lu\n", mm->ksm_zero_pages_sharing);
+		seq_printf(m, "ksm_merging_pages %lu\n", mm->ksm_merging_pages);
+		seq_printf(m, "ksm_process_profit %ld\n", ksm_process_profit(mm));
 		mmput(mm);
 	}