From: "Tzvetomir Stoyanov (VMware)" <tz.stoyanov@gmail.com>
To: rostedt@goodmis.org
Cc: linux-trace-devel@vger.kernel.org
Subject: [PATCH v31 13/16] trace-cmd: Read information for tsc to nanoseconds conversion from trace file
Date: Thu, 11 Mar 2021 10:48:54 +0200 [thread overview]
Message-ID: <20210311084857.1919805-14-tz.stoyanov@gmail.com> (raw)
In-Reply-To: <20210311084857.1919805-1-tz.stoyanov@gmail.com>
Read multiplier and shift, required for TSC clock to nanosecond
conversion from the metadata of the trace file and save them in
the tracecmd input file handler.
Signed-off-by: Tzvetomir Stoyanov (VMware) <tz.stoyanov@gmail.com>
---
lib/trace-cmd/trace-input.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/lib/trace-cmd/trace-input.c b/lib/trace-cmd/trace-input.c
index 971a6c01..1a3133e8 100644
--- a/lib/trace-cmd/trace-input.c
+++ b/lib/trace-cmd/trace-input.c
@@ -107,6 +107,12 @@ struct host_trace_info {
struct timesync_offsets *ts_offsets;
};
+struct tsc2nsec {
+ int mult;
+ int shift;
+ int offset;
+};
+
struct tracecmd_input {
struct tep_handle *pevent;
unsigned long file_state;
@@ -126,6 +132,8 @@ struct tracecmd_input {
bool use_pipe;
struct cpu_data *cpu_data;
long long ts_offset;
+ struct tsc2nsec tsc_calc;
+
struct host_trace_info host;
double ts2secs;
char * cpustats;
@@ -2727,6 +2735,16 @@ static int handle_options(struct tracecmd_input *handle)
case TRACECMD_OPTION_GUEST:
trace_guest_load(handle, buf, size);
break;
+ case TRACECMD_OPTION_TSC2NSEC:
+ if (size != 12)
+ break;
+ handle->tsc_calc.mult = tep_read_number(handle->pevent,
+ buf, 4);
+ handle->tsc_calc.shift = tep_read_number(handle->pevent,
+ buf + 4, 4);
+ handle->tsc_calc.offset = tep_read_number(handle->pevent,
+ buf + 8, 4);
+ break;
default:
warning("unknown option %d", option);
break;
--
2.29.2
next prev parent reply other threads:[~2021-03-11 8:49 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-11 8:48 [PATCH v31 00/16] Timestamp synchronization of host - guest tracing session Tzvetomir Stoyanov (VMware)
2021-03-11 8:48 ` [PATCH v31 01/16] trace-cmd: Add timestamp synchronization per vCPU Tzvetomir Stoyanov (VMware)
2021-03-11 8:48 ` [PATCH v31 02/16] trace-cmd: Add dummy function to initialize timestamp sync logic Tzvetomir Stoyanov (VMware)
2021-03-11 8:48 ` [PATCH v31 03/16] trace-cmd: Move time sync logic in the trace-cmd library Tzvetomir Stoyanov (VMware)
2021-03-11 8:48 ` [PATCH v31 04/16] trace-cmd: Wait for first time sync before the trace Tzvetomir Stoyanov (VMware)
2021-03-11 8:48 ` [PATCH v31 05/16] trace-cmd: PTP-like algorithm for host - guest timestamp synchronization Tzvetomir Stoyanov (VMware)
2021-03-11 8:48 ` [PATCH v31 06/16] trace-cmd: Debug scripts for " Tzvetomir Stoyanov (VMware)
2021-03-11 8:48 ` [PATCH v31 07/16] trace-cmd [POC]: Add KVM timestamp synchronization plugin Tzvetomir Stoyanov (VMware)
2021-03-11 8:48 ` [PATCH v31 08/16] trace-cmd: Add initial perf interface in trace-cmd library Tzvetomir Stoyanov (VMware)
2021-03-11 8:48 ` [PATCH v31 09/16] trace-cmd: Add logic for TSC to nanosecond conversion Tzvetomir Stoyanov (VMware)
2021-03-11 8:48 ` [PATCH v31 10/16] trace-cmd: Append new options into guest trace file at the end of the tracing session Tzvetomir Stoyanov (VMware)
2021-03-11 8:48 ` [PATCH v31 11/16] trace-cmd: Add a new option in trace file metadata for tsc2nsec conversion Tzvetomir Stoyanov (VMware)
2021-03-11 8:48 ` [PATCH v31 12/16] trace-cmd: Save information for tsc to nanoseconds conversion in trace file Tzvetomir Stoyanov (VMware)
2021-03-11 8:48 ` Tzvetomir Stoyanov (VMware) [this message]
2021-03-11 8:48 ` [PATCH v31 14/16] trace-cmd: Remove unneeded multiply in events timestamp reading Tzvetomir Stoyanov (VMware)
2021-03-11 8:48 ` [PATCH v31 15/16] trace-cmd: Perform all timestamp corrections in a single function Tzvetomir Stoyanov (VMware)
2021-03-11 8:48 ` [PATCH v31 16/16] trace-cmd: Convert tsc timestamps to nanosecods when reading trace data from a file Tzvetomir Stoyanov (VMware)
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