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__print_symbolic() is designed for exporting the print formatting table to
userspace and allows parsing tool, such as trace-cmd and perf, to analyze
trace log according to this print formatting table, meanwhile, by using
__print_symbolic()s, save space in the trace ring buffer.
original print format:
print fmt: "%s: %s: HDR:%s, CDB:%s", __get_str(str), __get_str(dev_name),
__print_hex(REC->hdr, sizeof(REC->hdr)),
__print_hex(REC->tsf, sizeof(REC->tsf))
after this change:
print fmt: "%s: %s: HDR:%s, CDB:%s",
print_symbolic(REC->str_t, {0, "send"},
{1, "complete"},
{2, "dev_complete"},
{3, "query_send"},
{4, "query_complete"},
{5, "query_complete_err"},
{6, "tm_send"},
{7, "tm_complete"},
{8, "tm_complete_err"}),
__get_str(dev_name), __print_hex(REC->hdr, sizeof(REC->hdr)),
__print_hex(REC->tsf, sizeof(REC->tsf))
Note: This patch just converts current __get_str(str) to __print_symbolic(),
the original tracing log will not be affected by this change, so it
doesn't break what current parsers expect.
Link: https://lore.kernel.org/r/20210105113446.16027-3-huobean@gmail.com
Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Bean Huo <beanhuo@micron.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
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| .. | ||
| acpi | ||
| asm-generic | ||
| clocksource | ||
| crypto | ||
| drm | ||
| dt-bindings | ||
| keys | ||
| kunit | ||
| kvm | ||
| linux | ||
| math-emu | ||
| media | ||
| memory | ||
| misc | ||
| net | ||
| pcmcia | ||
| ras | ||
| rdma | ||
| scsi | ||
| soc | ||
| sound | ||
| target | ||
| trace | ||
| uapi | ||
| vdso | ||
| video | ||
| xen | ||