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include "../../../../source/Commands/OptionsBase.td"
// The information of the start commands here should match the description of
// the intel-pt section of the jLLDBTraceStart packet in the
// lldb/docs/lldb-gdb-remote.txt documentation file. Similarly, it should match
// the API help message of TraceIntelPT::GetStartConfigurationHelp().
let Command = "thread trace start intel pt" in {
def thread_trace_start_intel_pt_size: Option<"size", "s">,
Group<1>,
Arg<"Value">,
Desc<"Trace size in bytes per thread. It must be a power of 2 greater "
"than or equal to 4096 (2^12). The trace is circular keeping "
"the most recent data. Defaults to 4096 bytes. It's possible to "
"specify size using multiples of unit bytes, e.g., 4KB, 1MB, 1MiB, "
"where 1K is 1024 bytes and 1M is 1048576 bytes.">;
def thread_trace_start_intel_pt_tsc: Option<"tsc", "t">,
Group<1>,
Desc<"Enable the use of TSC timestamps. This is supported on all devices "
"that support intel-pt.">;
def thread_trace_start_intel_pt_psb_period: Option<"psb-period", "p">,
Group<1>,
Arg<"Value">,
Desc<"This value defines the period in which PSB packets will be "
"generated. A PSB packet is a synchronization packet that contains a "
"TSC timestamp and the current absolute instruction pointer. "
"This parameter can only be used if "
"/sys/bus/event_source/devices/intel_pt/caps/psb_cyc is 1. Otherwise, "
"the PSB period will be defined by the processor. If supported, valid "
"values for this period can be found in "
"/sys/bus/event_source/devices/intel_pt/caps/psb_periods which "
"contains a hexadecimal number, whose bits represent valid values "
"e.g. if bit 2 is set, then value 2 is valid. The psb_period value is "
"converted to the approximate number of raw trace bytes between PSB "
"packets as: 2 ^ (value + 11), e.g. value 3 means 16KiB between PSB "
"packets. Defaults to 0 if supported.">;
}
let Command = "process trace start intel pt" in {
def process_trace_start_intel_pt_buffer_size: Option<"buffer-size", "s">,
Group<1>,
Arg<"Value">,
Desc<"Size in bytes used by each individual per-thread or per-cpu trace "
"buffer. It must be a power of 2 greater than or equal to 4096 (2^12) "
"bytes. It's possible to specify a unit for these bytes, like 4KB, "
"16KiB or 1MB. Lower case units are allowed for convenience.">;
def process_trace_start_intel_pt_per_cpu_tracing:
Option<"per-cpu-tracing", "c">,
Group<1>,
Desc<"Instead of having an individual trace buffer per thread, which uses "
"a number trace buffers proportional to the number of running "
"threads, this option triggers the collection on a per cpu core "
"basis. This effectively traces the entire activity on all cpus "
"using a limited amount of trace buffers regardless of the number of "
"threads. This might cause data loss for less frequent threads. This "
"option forces the capture of TSC timestamps (see --tsc). Also, this "
"option can't be used simulatenously with any other trace sessions "
"because of its system-wide nature.">;
def process_trace_start_intel_pt_process_size_limit:
Option<"total-size-limit", "l">,
Group<1>,
Arg<"Value">,
Desc<"Maximum total trace size per process in bytes. This limit applies to "
"the sum of the sizes of all thread and cpu traces of this process, "
"excluding the ones created with the \"thread trace start\" command. "
"Whenever a thread is attempted to be traced due to this command and "
"the limit would be reached, the process is stopped with a "
"\"processor trace\" reason, so that the user can retrace the process "
"if needed. Defaults to 500MB. It's possible to specify a unit for "
"these bytes, like 4KB, 16KiB or 1MB. Lower case units are allowed "
"for convenience.">;
def process_trace_start_intel_pt_tsc: Option<"tsc", "t">,
Group<1>,
Desc<"Enable the use of TSC timestamps. This is supported on all devices "
"that support intel-pt.">;
def process_trace_start_intel_pt_psb_period: Option<"psb-period", "p">,
Group<1>,
Arg<"Value">,
Desc<"This value defines the period in which PSB packets will be "
"generated. A PSB packet is a synchronization packet that contains a "
"TSC timestamp and the current absolute instruction pointer. "
"This parameter can only be used if "
"/sys/bus/event_source/devices/intel_pt/caps/psb_cyc is 1. Otherwise, "
"the PSB period will be defined by the processor. If supported, valid "
"values for this period can be found in "
"/sys/bus/event_source/devices/intel_pt/caps/psb_periods which "
"contains a hexadecimal number, whose bits represent valid values "
"e.g. if bit 2 is set, then value 2 is valid. The psb_period value is "
"converted to the approximate number of raw trace bytes between PSB "
"packets as: 2 ^ (value + 11), e.g. value 3 means 16KiB between PSB "
"packets. Defaults to 0 if supported.">;
def process_trace_start_intel_pt_disable_cgroup_filtering:
Option<"disable-cgroup-filtering", "d">,
Desc<"Disable the automatic cgroup filtering that is applied if --per-cpu "
"is provided. Cgroup filtering allows collecting intel pt data "
"exclusively of processes of the same cgroup as the target.">;
}
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