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0002-lparstat-Fix-Idle-and-busy-PURR-SPURR.patch
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File 0002-lparstat-Fix-Idle-and-busy-PURR-SPURR.patch of Package powerpc-utils
From 2af8c0b9a285e8a6104560d0f482819e56060443 Mon Sep 17 00:00:00 2001 From: Saket Kumar Bhaskar <skb99@linux.ibm.com> Date: Thu, 18 Jul 2024 00:39:24 +0530 Subject: [PATCH] lparstat: Fix Idle and busy PURR/SPURR Upstream: merged, expected in v1.3.13 Git-commit: 2af8c0b9a285e8a6104560d0f482819e56060443 lparstat -E gives %busy and %idle for actual(PURR based) and normalized (SPURR based).Idle and busy PURR/SPURR values are not adding upto 100% in case of dedicated-donate and shared partitions, with the present formula. Because of this, users might get a false impression of resource utilisation. This is expected because a core can be in either idle or busy state out of total of 100(core's shared resource can either be consumed or be left idle). When lpar is in dedicated-donate or shared,the purr values are not being counted when the CPU is ceded. The idle_purr is calculated by taking snapshots of purr values at every idle entry and idle exit. So, when a CPU is ceded, the calculation for idle_purr will be wrong as purr is not being counted. Before Change: |-----------------------------------------------------------------| | Dedicated-donate (8 cores) : | |----------------------|---------------------|--------------------| | | Actual | Normalized | | Stress-ng threads |---------------------|--------------------| | | %busy | %idle | %busy | %idle | |----------------------|----------|----------|---------|----------| | 0 threads | 0.02 | 0.05 | 0.02 | 0.05 | |----------------------|----------|----------|---------|----------| | 8 threads | 32.64 | 17.37 | 35.25 | 18.77 | |----------------------|----------|----------|---------|----------| | 16 threads | 58.61 | 16.42 | 63.29 | 17.74 | |----------------------|----------|----------|---------|----------| | 24 threads | 78.14 | 21.86 | 84.39 | 23.61 | |----------------------|----------|----------|---------|----------| | 32 threads | 83.60 | 16.40 | 90.30 | 17.71 | |----------------------|----------|----------|---------|----------| | 40 threads | 91.90 | 6.94 | 98.31 | 7.46 | |----------------------|----------|----------|---------|----------| | 48 threads | 96.08 | 3.92 | 102.79 | 4.21 | |----------------------|----------|----------|---------|----------| | 56 threads | 98.42 | 1.57 | 105.31 | 1.69 | |----------------------|----------|----------|---------|----------| | 64 threads | 100.00 | 0.00 | 106.00 | 0.00 | |----------------------|----------|----------|---------|----------| |-----------------------------------------------------------------| | Shared Capped (8 VP / 4 EC) : | |----------------------|---------------------|--------------------| | | Actual | Normalized | | Stress-ng threads |---------------------|--------------------| | | %busy | %idle | %busy | %idle | |----------------------|----------|----------|---------|----------| | 0 threads | 0.04 | 0.18 | 0.03 | 0.19 | |----------------------|----------|----------|---------|----------| | 8 threads | 35.90 | 14.09 | 38.77 | 15.21 | |----------------------|----------|----------|---------|----------| | 16 threads | 35.25 | 14.84 | 38.08 | 16.02 | |----------------------|----------|----------|---------|----------| | 24 threads | 40.13 | 9.73 | 42.93 | 10.43 | |----------------------|----------|----------|---------|----------| | 32 threads | 44.13 | 5.73 | 47.22 | 6.14 | |----------------------|----------|----------|---------|----------| | 40 threads | 46.47 | 3.42 | 50.18 | 3.69 | |----------------------|----------|----------|---------|----------| | 48 threads | 48.03 | 1.83 | 51.39 | 1.96 | |----------------------|----------|----------|---------|----------| | 56 threads | 49.04 | 0.86 | 52.47 | 0.93 | |----------------------|----------|----------|---------|----------| | 64 threads | 49.87 | 0.00 | 53.36 | 0.00 | |----------------------|----------|----------|---------|----------| This commit, rather than considering delta_idle_purr for calculation of idle ticks, takes (delta_tb - delta_purr + delta_idle_purr) as total ticks for which the CPUs were idle. Here, since delta_idle_purr will also contain some idle ticks, thats why it is added to the formula. Since, the output was correct for dedicated capped mode, changes has been made only for shared and dedicated-donate mode. Further, no changes has been made for calculation of %busy. Similar changes has been done for SPURR. After Change: |-----------------------------------------------------------------| | Dedicated-donate (8 cores) : | |----------------------|---------------------|--------------------| | | Actual | Normalized | | Stress-ng threads |---------------------|--------------------| | | %busy | %idle | %busy | %idle | |----------------------|----------|----------|---------|----------| | 0 threads | 0.02 | 99.98 | 0.02 | 100.04 | |----------------------|----------|----------|---------|----------| | 8 threads | 35.97 | 64.03 | 38.84 | 61.51 | |----------------------|----------|----------|---------|----------| | 16 threads | 58.60 | 41.40 | 63.28 | 37.08 | |----------------------|----------|----------|---------|----------| | 24 threads | 78.14 | 21.86 | 84.39 | 23.61 | |----------------------|----------|----------|---------|----------| | 32 threads | 83.60 | 16.41 | 90.29 | 17.71 | |----------------------|----------|----------|---------|----------| | 40 threads | 92.96 | 7.04 | 100.39 | 7.61 | |----------------------|----------|----------|---------|----------| | 48 threads | 96.08 | 3.92 | 103.77 | 4.24 | |----------------------|----------|----------|---------|----------| | 56 threads | 98.42 | 1.58 | 105.31 | 1.68 | |----------------------|----------|----------|---------|----------| | 64 threads | 100.00 | 0.00 | 107.00 | 0.00 | |----------------------|----------|----------|---------|----------| |-----------------------------------------------------------------| | Shared Capped (8 VP / 4 EC) : | |----------------------|---------------------|--------------------| | | Actual | Normalized | | Stress-ng threads |---------------------|--------------------| | | %busy | %idle | %busy | %idle | |----------------------|----------|----------|---------|----------| | 0 threads | 0.03 | 99.97 | 0.19 | 99.44 | |----------------------|----------|----------|---------|----------| | 8 threads | 35.91 | 64.09 | 38.78 | 61.58 | |----------------------|----------|----------|---------|----------| | 16 threads | 36.83 | 63.17 | 39.78 | 60.55 | |----------------------|----------|----------|---------|----------| | 24 threads | 40.16 | 59.84 | 43.37 | 56.95 | |----------------------|----------|----------|---------|----------| | 32 threads | 44.47 | 55.53 | 48.02 | 52.38 | |----------------------|----------|----------|---------|----------| | 40 threads | 46.55 | 53.45 | 50.27 | 50.04 | |----------------------|----------|----------|---------|----------| | 48 threads | 48.13 | 51.87 | 52.48 | 47.82 | |----------------------|----------|----------|---------|----------| | 56 threads | 49.01 | 50.99 | 52.93 | 47.41 | |----------------------|----------|----------|---------|----------| | 64 threads | 49.90 | 50.10 | 53.40 | 46.19 | |----------------------|----------|----------|---------|----------| Before Change: %idle = delta_idle_purr / delta_tb * 100 After Change: %idle = (delta_tb - delta_purr + delta_idle_purr) / delta_tb * 100 Signed-off-by: Saket Kumar Bhaskar <skb99@linux.ibm.com> Signed-off-by: Tyrel Datwyler <tyreld@linux.ibm.com> --- src/lparstat.c | 49 ++++++++++++++++++++++++++++++++++++++++++------- 1 file changed, 42 insertions(+), 7 deletions(-) diff --git a/src/lparstat.c b/src/lparstat.c index d2fdb3f..9d9ba1b 100644 --- a/src/lparstat.c +++ b/src/lparstat.c @@ -515,11 +515,17 @@ void get_cpu_idle_purr(struct sysentry *unused_se, char *buf) { double delta_tb, delta_purr, delta_idle_purr; double physc, idle; + char *descr; + char mode[32]; delta_tb = get_scaled_tb(); delta_purr = get_delta_value("purr"); delta_idle_purr = get_delta_value("idle_purr"); + get_sysdata("shared_processor_mode", &descr, mode); + if (!strcmp(mode, "Dedicated")) + get_sysdata("DedDonMode", &descr, mode); + /* * Given that these values are read from different * sources (purr from lparcfg and idle_purr from sysfs), @@ -528,10 +534,23 @@ void get_cpu_idle_purr(struct sysentry *unused_se, char *buf) */ if (delta_idle_purr > delta_purr) delta_idle_purr = delta_purr; - - physc = (delta_purr - delta_idle_purr) / delta_tb; - idle = (delta_purr / delta_tb) - physc; - idle *= 100.00; + /* + * Round down delta_purr to delta_tb if delta_tb - delta_purr + * error is under -1%. + */ + if (((delta_tb - delta_purr + delta_idle_purr) / delta_tb * 100) > -1 && ((delta_tb - delta_purr + delta_idle_purr) / delta_tb * 100) < 0) + delta_purr = delta_tb; + + if (!strcmp(mode, "Capped")) { + /* For dedicated - capped mode */ + physc = (delta_purr - delta_idle_purr) / delta_tb; + idle = (delta_purr / delta_tb) - physc; + idle *= 100.00; + } else { + /* For shared and dedicated - donate mode */ + idle = (delta_tb - delta_purr + delta_idle_purr) / delta_tb; + idle *= 100.00; + } sprintf(buf, "%.2f", idle); } @@ -559,14 +578,30 @@ void get_cpu_idle_spurr(struct sysentry *unused_se, char *buf) double delta_tb, delta_spurr, delta_idle_spurr; double physc, idle; double rfreq; + char *descr; + char mode[32]; delta_tb = get_scaled_tb(); delta_spurr = get_delta_value("spurr"); delta_idle_spurr = get_delta_value("idle_spurr"); - physc = (delta_spurr - delta_idle_spurr) / delta_tb; - idle = (delta_spurr / delta_tb) - physc; - idle *= 100.00; + get_sysdata("shared_processor_mode", &descr, mode); + if (!strcmp(mode, "Dedicated")) + get_sysdata("DedDonMode", &descr, mode); + + if (delta_spurr > delta_tb) + delta_spurr = delta_tb; + + if (!strcmp(mode, "Capped")) { + /* For dedicated - capped mode */ + physc = (delta_spurr - delta_idle_spurr) / delta_tb; + idle = (delta_spurr / delta_tb) - physc; + idle *= 100.00; + } else { + /* For shared and dedicated - donate mode */ + idle = (delta_tb - delta_spurr + delta_idle_spurr) / delta_tb; + idle *= 100.00; + } rfreq = round_off_freq(); idle += ((idle * rfreq) / 100); -- 2.45.2
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