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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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7423907283
Impact: Split the boot tracer entries in two parts: call and return
Now that we are using the sched tracer from the boot tracer, we want
to use the same timestamp than the ring-buffer to have consistent time
captures between sched events and initcall events.
So we get rid of the old time capture by the boot tracer and split the
initcall events in two parts: call and return. This way we have the
ring buffer timestamp of both.
An example trace:
[ 27.904149584] calling net_ns_init+0x0/0x1c0 @ 1
[ 27.904429624] initcall net_ns_init+0x0/0x1c0 returned 0 after 0 msecs
[ 27.904575926] calling reboot_init+0x0/0x20 @ 1
[ 27.904655399] initcall reboot_init+0x0/0x20 returned 0 after 0 msecs
[ 27.904800228] calling sysctl_init+0x0/0x30 @ 1
[ 27.905142914] initcall sysctl_init+0x0/0x30 returned 0 after 0 msecs
[ 27.905287211] calling ksysfs_init+0x0/0xb0 @ 1
##### CPU 0 buffer started ####
init-1 [000] 27.905395: 1:120:R + [001] 11:115:S
##### CPU 1 buffer started ####
<idle>-0 [001] 27.905425: 0:140:R ==> [001] 11:115:R
init-1 [000] 27.905426: 1:120:D ==> [000] 0:140:R
<idle>-0 [000] 27.905431: 0:140:R + [000] 4:115:S
<idle>-0 [000] 27.905451: 0:140:R ==> [000] 4:115:R
ksoftirqd/0-4 [000] 27.905456: 4:115:S ==> [000] 0:140:R
udevd-11 [001] 27.905458: 11:115:R + [001] 14:115:R
<idle>-0 [000] 27.905459: 0:140:R + [000] 4:115:S
<idle>-0 [000] 27.905462: 0:140:R ==> [000] 4:115:R
udevd-11 [001] 27.905462: 11:115:R ==> [001] 14:115:R
ksoftirqd/0-4 [000] 27.905467: 4:115:S ==> [000] 0:140:R
<idle>-0 [000] 27.905470: 0:140:R + [000] 4:115:S
<idle>-0 [000] 27.905473: 0:140:R ==> [000] 4:115:R
ksoftirqd/0-4 [000] 27.905476: 4:115:S ==> [000] 0:140:R
<idle>-0 [000] 27.905479: 0:140:R + [000] 4:115:S
<idle>-0 [000] 27.905482: 0:140:R ==> [000] 4:115:R
ksoftirqd/0-4 [000] 27.905486: 4:115:S ==> [000] 0:140:R
udevd-14 [001] 27.905499: 14:120:X ==> [001] 11:115:R
udevd-11 [001] 27.905506: 11:115:R + [000] 1:120:D
<idle>-0 [000] 27.905515: 0:140:R ==> [000] 1:120:R
udevd-11 [001] 27.905517: 11:115:S ==> [001] 0:140:R
[ 27.905557107] initcall ksysfs_init+0x0/0xb0 returned 0 after 3906 msecs
[ 27.905705736] calling init_jiffies_clocksource+0x0/0x10 @ 1
[ 27.905779239] initcall init_jiffies_clocksource+0x0/0x10 returned 0 after 0 msecs
[ 27.906769814] calling pm_init+0x0/0x30 @ 1
[ 27.906853627] initcall pm_init+0x0/0x30 returned 0 after 0 msecs
[ 27.906997803] calling pm_disk_init+0x0/0x20 @ 1
[ 27.907076946] initcall pm_disk_init+0x0/0x20 returned 0 after 0 msecs
[ 27.907222556] calling swsusp_header_init+0x0/0x30 @ 1
[ 27.907294325] initcall swsusp_header_init+0x0/0x30 returned 0 after 0 msecs
[ 27.907439620] calling stop_machine_init+0x0/0x50 @ 1
init-1 [000] 27.907485: 1:120:R + [000] 2:115:S
init-1 [000] 27.907490: 1:120:D ==> [000] 2:115:R
kthreadd-2 [000] 27.907507: 2:115:R + [001] 15:115:R
<idle>-0 [001] 27.907517: 0:140:R ==> [001] 15:115:R
kthreadd-2 [000] 27.907517: 2:115:D ==> [000] 0:140:R
<idle>-0 [000] 27.907521: 0:140:R + [000] 4:115:S
<idle>-0 [000] 27.907524: 0:140:R ==> [000] 4:115:R
udevd-15 [001] 27.907527: 15:115:D + [000] 2:115:D
ksoftirqd/0-4 [000] 27.907537: 4:115:S ==> [000] 2:115:R
udevd-15 [001] 27.907537: 15:115:D ==> [001] 0:140:R
kthreadd-2 [000] 27.907546: 2:115:R + [000] 1:120:D
kthreadd-2 [000] 27.907550: 2:115:S ==> [000] 1:120:R
init-1 [000] 27.907584: 1:120:R + [000] 15: 0:D
init-1 [000] 27.907589: 1:120:R + [000] 2:115:S
init-1 [000] 27.907593: 1:120:D ==> [000] 15: 0:R
udevd-15 [000] 27.907601: 15: 0:S ==> [000] 2:115:R
##### CPU 0 buffer started ####
kthreadd-2 [000] 27.907616: 2:115:R + [001] 16:115:R
##### CPU 1 buffer started ####
<idle>-0 [001] 27.907620: 0:140:R ==> [001] 16:115:R
kthreadd-2 [000] 27.907621: 2:115:D ==> [000] 0:140:R
udevd-16 [001] 27.907625: 16:115:D + [000] 2:115:D
<idle>-0 [000] 27.907628: 0:140:R + [000] 4:115:S
udevd-16 [001] 27.907629: 16:115:D ==> [001] 0:140:R
<idle>-0 [000] 27.907631: 0:140:R ==> [000] 4:115:R
ksoftirqd/0-4 [000] 27.907636: 4:115:S ==> [000] 2:115:R
kthreadd-2 [000] 27.907644: 2:115:R + [000] 1:120:D
kthreadd-2 [000] 27.907647: 2:115:S ==> [000] 1:120:R
init-1 [000] 27.907657: 1:120:R + [001] 16: 0:D
<idle>-0 [001] 27.907666: 0:140:R ==> [001] 16: 0:R
[ 27.907703862] initcall stop_machine_init+0x0/0x50 returned 0 after 0 msecs
[ 27.907850704] calling filelock_init+0x0/0x30 @ 1
[ 27.907926573] initcall filelock_init+0x0/0x30 returned 0 after 0 msecs
[ 27.908071327] calling init_script_binfmt+0x0/0x10 @ 1
[ 27.908165195] initcall init_script_binfmt+0x0/0x10 returned 0 after 0 msecs
[ 27.908309461] calling init_elf_binfmt+0x0/0x10 @ 1
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
57 lines
1.5 KiB
C
57 lines
1.5 KiB
C
#ifndef _LINUX_TRACE_BOOT_H
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#define _LINUX_TRACE_BOOT_H
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/*
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* Structure which defines the trace of an initcall
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* while it is called.
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* You don't have to fill the func field since it is
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* only used internally by the tracer.
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*/
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struct boot_trace_call {
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pid_t caller;
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char func[KSYM_NAME_LEN];
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};
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/*
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* Structure which defines the trace of an initcall
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* while it returns.
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*/
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struct boot_trace_ret {
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char func[KSYM_NAME_LEN];
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int result;
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unsigned long long duration; /* nsecs */
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};
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#ifdef CONFIG_BOOT_TRACER
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/* Append the traces on the ring-buffer */
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extern void trace_boot_call(struct boot_trace_call *bt, initcall_t fn);
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extern void trace_boot_ret(struct boot_trace_ret *bt, initcall_t fn);
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/* Tells the tracer that smp_pre_initcall is finished.
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* So we can start the tracing
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*/
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extern void start_boot_trace(void);
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/* Resume the tracing of other necessary events
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* such as sched switches
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*/
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extern void enable_boot_trace(void);
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/* Suspend this tracing. Actually, only sched_switches tracing have
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* to be suspended. Initcalls doesn't need it.)
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*/
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extern void disable_boot_trace(void);
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#else
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static inline
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void trace_boot_call(struct boot_trace_call *bt, initcall_t fn) { }
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static inline
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void trace_boot_ret(struct boot_trace_ret *bt, initcall_t fn) { }
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static inline void start_boot_trace(void) { }
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static inline void enable_boot_trace(void) { }
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static inline void disable_boot_trace(void) { }
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#endif /* CONFIG_BOOT_TRACER */
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#endif /* __LINUX_TRACE_BOOT_H */
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