linux-kernel - [PATCH] x86/platform/uv/BAU: Fix congested_response

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Date:   Thu, 13 Jul 2017 13:33:23 -0500
From:   Justin Ernst <justin.ernst@....com>
To:     mingo@...hat.com
Cc:     abanman@....com, tglx@...utronix.de, hpa@...or.com, x86@...nel.org,
        mike.travis@....com, sivanich@....com,
        linux-kernel@...r.kernel.org, Justin Ernst <justin.ernst@....com>
Subject: [PATCH] x86/platform/uv/BAU: Fix congested_response_us not taking effect

Bug fix for the BAU tunable congested_cycles not being set to the user
defined value. Instead of referencing a global variable when deciding
on BAU shutdown, a node will reference its own tunable set
value ( cong_response_us). This results in the user set
tunable value congested_response_us taking effect correctly.

Signed-off-by: Justin Ernst <justin.ernst@....com>
Acked-by: Andrew Banman <abanman@....com>
---
 arch/x86/platform/uv/tlb_uv.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/arch/x86/platform/uv/tlb_uv.c b/arch/x86/platform/uv/tlb_uv.c
index 2983faa..8ce4657 100644
--- a/arch/x86/platform/uv/tlb_uv.c
+++ b/arch/x86/platform/uv/tlb_uv.c
@@ -40,7 +40,6 @@
 static int timeout_us;
 static bool nobau = true;
 static int nobau_perm;
-static cycles_t congested_cycles;
 
 /* tunables: */
 static int max_concurr		= MAX_BAU_CONCURRENT;
@@ -849,10 +848,10 @@ static void record_send_stats(cycles_t time1, cycles_t time2,
 		if ((completion_status == FLUSH_COMPLETE) && (try == 1)) {
 			bcp->period_requests++;
 			bcp->period_time += elapsed;
-			if ((elapsed > congested_cycles) &&
+			if ((elapsed > usec_2_cycles(bcp->cong_response_us)) &&
 			    (bcp->period_requests > bcp->cong_reps) &&
 			    ((bcp->period_time / bcp->period_requests) >
-							congested_cycles)) {
+					usec_2_cycles(bcp->cong_response_us))) {
 				stat->s_congested++;
 				disable_for_period(bcp, stat);
 			}
@@ -2247,7 +2246,6 @@ static int __init uv_bau_init(void)
 	}
 
 	nuvhubs = uv_num_possible_blades();
-	congested_cycles = usec_2_cycles(congested_respns_us);
 
 	uv_base_pnode = 0x7fffffff;
 	for (uvhub = 0; uvhub < nuvhubs; uvhub++) {
-- 
1.8.5.6