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author | Haifeng Xu <haifeng.xu@shopee.com> | 2024-04-08 12:23:03 +0300 |
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committer | Borislav Petkov (AMD) <bp@alien8.de> | 2024-04-24 15:24:48 +0300 |
commit | 931be446c6cbc15691dd499957e961f4e1d56afb (patch) | |
tree | 5244e1021c9607b551d545716e6f58ba1da7d621 /arch/x86/kernel/cpu/resctrl/trace.h | |
parent | 87739229485ac724849178eb6c35e38c6161eb77 (diff) | |
download | linux-931be446c6cbc15691dd499957e961f4e1d56afb.tar.xz |
x86/resctrl: Add tracepoint for llc_occupancy tracking
In our production environment, after removing monitor groups, those
unused RMIDs get stuck in the limbo list forever because their
llc_occupancy is always larger than the threshold. But the unused RMIDs
can be successfully freed by turning up the threshold.
In order to know how much the threshold should be, perf can be used to
acquire the llc_occupancy of RMIDs in each rdt domain.
Instead of using perf tool to track llc_occupancy and filter the log
manually, it is more convenient for users to use tracepoint to do this
work. So add a new tracepoint that shows the llc_occupancy of busy RMIDs
when scanning the limbo list.
Suggested-by: Reinette Chatre <reinette.chatre@intel.com>
Suggested-by: James Morse <james.morse@arm.com>
Signed-off-by: Haifeng Xu <haifeng.xu@shopee.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: James Morse <james.morse@arm.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Link: https://lore.kernel.org/r/20240408092303.26413-3-haifeng.xu@shopee.com
Diffstat (limited to 'arch/x86/kernel/cpu/resctrl/trace.h')
-rw-r--r-- | arch/x86/kernel/cpu/resctrl/trace.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/resctrl/trace.h b/arch/x86/kernel/cpu/resctrl/trace.h index 495fb90c8572..2a506316b303 100644 --- a/arch/x86/kernel/cpu/resctrl/trace.h +++ b/arch/x86/kernel/cpu/resctrl/trace.h @@ -35,6 +35,22 @@ TRACE_EVENT(pseudo_lock_l3, TP_printk("hits=%llu miss=%llu", __entry->l3_hits, __entry->l3_miss)); +TRACE_EVENT(mon_llc_occupancy_limbo, + TP_PROTO(u32 ctrl_hw_id, u32 mon_hw_id, int domain_id, u64 llc_occupancy_bytes), + TP_ARGS(ctrl_hw_id, mon_hw_id, domain_id, llc_occupancy_bytes), + TP_STRUCT__entry(__field(u32, ctrl_hw_id) + __field(u32, mon_hw_id) + __field(int, domain_id) + __field(u64, llc_occupancy_bytes)), + TP_fast_assign(__entry->ctrl_hw_id = ctrl_hw_id; + __entry->mon_hw_id = mon_hw_id; + __entry->domain_id = domain_id; + __entry->llc_occupancy_bytes = llc_occupancy_bytes;), + TP_printk("ctrl_hw_id=%u mon_hw_id=%u domain_id=%d llc_occupancy_bytes=%llu", + __entry->ctrl_hw_id, __entry->mon_hw_id, __entry->domain_id, + __entry->llc_occupancy_bytes) + ); + #endif /* _TRACE_RESCTRL_H */ #undef TRACE_INCLUDE_PATH |