[PATCH 2/2] sched/cache: Fix decision matrix comment above can_migrate_llc()

[Tim Chen <tim.c.chen@linux.intel.com>]

The example tables in the comment did not match what the function
computes with the default thresholds. The imbalance test is a ratio,
so 50% is noticeably busier than 40% (25% above), and several cells
were wrong: 40%->60% toward the preferred LLC is forbidden, 50%->30%
out of the preferred LLC is allowed, and 60%->40% out is allowed.

Use 45% instead of 40% so the tables also illustrate the imb_pct
hysteresis, and recompute every cell from the code.

Fixes: 23b2b5ccc45ce ("sched/cache: Introduce helper functions to enforce LLC migration policy")
Cc: stable@vger.kernel.org # v7.2.y v7.3.y
Co-developed-by: Chen Yu <yu.c.chen@intel.com>
Signed-off-by: Chen Yu <yu.c.chen@intel.com>
Signed-off-by: Tim Chen <tim.c.chen@linux.intel.com>
---
 kernel/sched/fair.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index cfc982205b98..5770ae37d1dc 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -10837,20 +10837,20 @@ static __maybe_unused bool get_llc_stats(int cpu, unsigned long *util,
  * 1. moving towards the preferred LLC, dst is the preferred
  *    LLC, src is not.
  *
- * src \ dst      30%  40%  50%  60%
- * 30%            Y    Y    Y    N
- * 40%            Y    Y    Y    Y
+ * src \ dst      30%  45%  50%  60%
+ * 30%            Y    Y    N    N
+ * 45%            Y    Y    Y    N
  * 50%            Y    Y    G    G
  * 60%            Y    Y    G    G
  *
  * 2. moving out of the preferred LLC, src is the preferred
  *    LLC, dst is not:
  *
- * src \ dst      30%  40%  50%  60%
+ * src \ dst      30%  45%  50%  60%
  * 30%            N    N    N    N
- * 40%            N    N    N    N
- * 50%            N    N    G    G
- * 60%            Y    N    G    G
+ * 45%            N    N    N    N
+ * 50%            Y    N    G    G
+ * 60%            Y    Y    G    G
  *
  * src :      src_util
  * dst :      dst_util
-- 
2.32.0