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| author | Denis V. Lunev <den@openvz.org> | 2024-09-05 21:19:41 +0200 |
|---|---|---|
| committer | Peter Xu <peterx@redhat.com> | 2024-09-09 10:55:40 -0400 |
| commit | 89bccecdda253c9a1a38921cf9266a4f9655c88c (patch) | |
| tree | 27abc91d157b20b6e9ac25b6d6743e7d2d89c56c | |
| parent | afe166d4e8bc33bc448cd573b55d0ac094187d48 (diff) | |
| download | qemu-89bccecdda253c9a1a38921cf9266a4f9655c88c.zip qemu-89bccecdda253c9a1a38921cf9266a4f9655c88c.tar.gz qemu-89bccecdda253c9a1a38921cf9266a4f9655c88c.tar.bz2 | |
system: improve migration debug
Right now migration_throttle() tracepoint lacks very important
important information, i.e. no one could easily say how much the guest
is throttled. This makes difficult to debug guest quality of service
during migration.
This patch adds one more tracepoint into cpu_throttle_set() which is
actually doing this job.
Signed-off-by: Denis V. Lunev <den@openvz.org>
CC: Peter Xu <peterx@redhat.com>
CC: Fabiano Rosas <farosas@suse.de>
CC: Paolo Bonzini <pbonzini@redhat.com>
Link: https://lore.kernel.org/r/20240905191941.310592-1-den@openvz.org
Signed-off-by: Peter Xu <peterx@redhat.com>
| -rw-r--r-- | system/cpu-throttle.c | 3 | ||||
| -rw-r--r-- | system/trace-events | 3 |
2 files changed, 6 insertions, 0 deletions
diff --git a/system/cpu-throttle.c b/system/cpu-throttle.c index c951a6c..7632dc6 100644 --- a/system/cpu-throttle.c +++ b/system/cpu-throttle.c @@ -28,6 +28,7 @@ #include "qemu/main-loop.h" #include "sysemu/cpus.h" #include "sysemu/cpu-throttle.h" +#include "trace.h" /* vcpu throttling controls */ static QEMUTimer *throttle_timer; @@ -95,6 +96,8 @@ void cpu_throttle_set(int new_throttle_pct) */ bool throttle_active = cpu_throttle_active(); + trace_cpu_throttle_set(new_throttle_pct); + /* Ensure throttle percentage is within valid range */ new_throttle_pct = MIN(new_throttle_pct, CPU_THROTTLE_PCT_MAX); new_throttle_pct = MAX(new_throttle_pct, CPU_THROTTLE_PCT_MIN); diff --git a/system/trace-events b/system/trace-events index 2ed1d59..074d001 100644 --- a/system/trace-events +++ b/system/trace-events @@ -44,3 +44,6 @@ dirtylimit_state_finalize(void) dirtylimit_throttle_pct(int cpu_index, uint64_t pct, int64_t time_us) "CPU[%d] throttle percent: %" PRIu64 ", throttle adjust time %"PRIi64 " us" dirtylimit_set_vcpu(int cpu_index, uint64_t quota) "CPU[%d] set dirty page rate limit %"PRIu64 dirtylimit_vcpu_execute(int cpu_index, int64_t sleep_time_us) "CPU[%d] sleep %"PRIi64 " us" + +# cpu-throttle.c +cpu_throttle_set(int new_throttle_pct) "set guest CPU throttled by %d%%" |