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@hpe.com>
Acked-by: Andrew Banman <abanman@hpe.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: mike.travis@hpe.com
Cc: sivanich@hpe.com
Link: http://lkml.kernel.org/r/1499970803-282432-1-git-send-email-justin.ernst@hpe.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/arch/x86/platform/uv/tlb_uv.c b/arch/x86/platform/uv/tlb_uv.c
index d4a61dd..fd87591 100644 (file)
--- a/arch/x86/platform/uv/tlb_uv.c
+++ b/arch/x86/platform/uv/tlb_uv.c
@@ -40,7 +40,6 @@ static int timeout_base_ns[] = {
 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;
@@ -829,10 +828,10 @@ 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);
                        }
@@ -2228,7 +2227,6 @@ 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++) {