Author: cperciva
Date: Sun Dec 31 09:22:07 2017
New Revision: 327425
URL: https://svnweb.freebsd.org/changeset/base/327425
Log:
Use the TSLOG framework to record entry/exit timestamps for hammer_time.
The entry must be logged "manually" using TSRAW rather than TSENTER
since PCPU data structures have not yet been initialized and thus
curthread cannot be accessed; &thread0 is what will become curthread
later in hammer_time.
Other MD initialization code should be similarly instrumented in order
to gain visibility into the time spent before entering mi_startup; this
will require some care and testing from people with access to such
hardware.
Modified:
head/sys/amd64/amd64/machdep.c
Modified: head/sys/amd64/amd64/machdep.c
==============================================================================
--- head/sys/amd64/amd64/machdep.c Sun Dec 31 09:21:34 2017
(r327424)
+++ head/sys/amd64/amd64/machdep.c Sun Dec 31 09:22:07 2017
(r327425)
@@ -1525,6 +1525,8 @@ hammer_time(u_int64_t modulep, u_int64_t physfree)
size_t kstack0_sz;
int late_console;
+ TSRAW(&thread0, TS_ENTER, __func__, NULL);
+
/*
* This may be done better later if it gets more high level
* components in it. If so just link td->td_proc here.
@@ -1773,6 +1775,8 @@ hammer_time(u_int64_t modulep, u_int64_t physfree)
x86_init_fdt();
#endif
thread0.td_critnest = 0;
+
+ TSEXIT();
/* Location of kernel stack for locore */
return ((u_int64_t)thread0.td_pcb);
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