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From: Colin Percival <cperciva@FreeBSD.org>
Date: Sun, 31 Dec 2017 09:22:07 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r327425 - head/sys/amd64/amd64
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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);