File lparstat-report-mixed-SMT-state.patch of Package powerpc-utils

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File lparstat-report-mixed-SMT-state.patch of Package powerpc-utils

From 5d2e43bbf0804da52202f817f7f7fc5f18aafd11 Mon Sep 17 00:00:00 2001
From: Laurent Dufour <ldufour@linux.ibm.com>
Date: Tue, 2 May 2023 16:54:35 +0200
Subject: [PATCH 2/3] lparstat: report mixed SMT state

when SMT state is mixed like this one (CPU 4 is offline):

$ ppc64_cpu --info
Core   0:    0*    1*    2*    3*    4     5*    6*    7*
Core   1:    8*    9*   10*   11*   12*   13*   14*   15*
Core   2:   16*   17*   18*   19*   20*   21*   22*   23*
Core   3:   24*   25*   26*   27*   28*   29*   30*   31*
Core   4:   32*   33*   34*   35*   36*   37*   38*   39*
Core   5:   40*   41*   42*   43*   44*   45*   46*   47*
$ ppc64_cpu --smt
SMT=7: 0
SMT=8: 1-5

ppc64_cpu --smt is handling that nicely but lparstat failed reporting the
SMT state:
$ /usr/sbin/lparstat
Failed to get smt state

System Configuration
type=Dedicated mode=Capped smt=Capped lcpu=6 mem=65969728 kB cpus=0 ent=6.00

%user  %sys %wait    %idle    physc %entc lbusy   app  vcsw phint
----- ----- -----    -----    ----- ----- ----- ----- ----- -----
 0.02  0.01  0.00    99.97     3.41 56.83  0.02  0.00 4061778   156

Makes lparstat reporting "smt=mixed" in that case.
__do_smt is now returning 0 when the SMT state is mixed instead of -1 which
is also reported when an error is detected.
This doesn't change the call made by ppc64_cpu which is using
print_smt_state=true and so is expecting a returned value equal to 0 or -1.

With that patch applied, lparstat print that in the above case:
$lparstat

System Configuration
type=Dedicated mode=Capped smt=Mixed lcpu=6 mem=65969728 kB cpus=0 ent=6.00

%user  %sys %wait    %idle    physc %entc lbusy   app  vcsw phint
----- ----- -----    -----    ----- ----- ----- ----- ----- -----
 0.01  0.01  0.00    99.97     3.43 57.17  0.02  0.00 4105654   156

Signed-off-by: Laurent Dufour <ldufour@linux.ibm.com>
---
 src/common/cpu_info_helpers.c | 4 ++--
 src/lparstat.c                | 4 +++-
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/common/cpu_info_helpers.c b/src/common/cpu_info_helpers.c
index 925f220..c05d96d 100644
--- a/src/common/cpu_info_helpers.c
+++ b/src/common/cpu_info_helpers.c
@@ -245,7 +245,7 @@ int __do_smt(bool numeric, int cpus_in_system, int threads_per_cpu,
 			if (smt_state == 0)
 				smt_state = thread + 1;
 			else if (smt_state > 0)
-				smt_state = -1; /* mix of SMT modes */
+				smt_state = 0; /* mix of SMT modes */
 		}
 	}
 
@@ -257,7 +257,7 @@ int __do_smt(bool numeric, int cpus_in_system, int threads_per_cpu,
 			printf("SMT=1\n");
 		else
 			printf("SMT is off\n");
-	} else if (smt_state == -1) {
+	} else if (smt_state == 0) {
 		for (thread = 0; thread < threads_per_cpu; thread++) {
 			if (CPU_COUNT_S(cpu_state_size,
 						cpu_states[thread])) {
diff --git a/src/lparstat.c b/src/lparstat.c
index eebba1f..a9e7bce 100644
--- a/src/lparstat.c
+++ b/src/lparstat.c
@@ -884,13 +884,15 @@ void get_smt_mode(struct sysentry *se, char *buf)
 	}
 
 	smt_state = parse_smt_state();
-	if (smt_state < 0) {
+	if (smt_state == -1) {
 		fprintf(stderr, "Failed to get smt state\n");
 		return;
 	}
 
 	if (smt_state == 1)
 		sprintf(buf, "Off");
+	else if (smt_state == 0)
+		sprintf(buf, "Mixed");
 	else
 		sprintf(buf, "%d", smt_state);
 }
-- 
2.40.1

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File lparstat-report-mixed-SMT-state.patch of Package powerpc-utils

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