svn commit: r327424 - head/sys/conf
Colin Percival
cperciva at FreeBSD.org
Sun Dec 31 09:21:36 UTC 2017
Author: cperciva
Date: Sun Dec 31 09:21:34 2017
New Revision: 327424
URL: https://svnweb.freebsd.org/changeset/base/327424
Log:
Connect kern_tslog.c to the build and add TSLOG / TSLOGSIZE kernel options.
These are intended for debugging purposes and should not be added to
"generic" kernel configurations since they result in a nontrivial amount
of memory being set aside for this purpose, can break if kernel modules are
unloaded, and can potentially leak a dangerous amount of information about
timestamps used as a source of kernel entropy.
Modified:
head/sys/conf/NOTES
head/sys/conf/files
head/sys/conf/options
Modified: head/sys/conf/NOTES
==============================================================================
--- head/sys/conf/NOTES Sun Dec 31 09:21:01 2017 (r327423)
+++ head/sys/conf/NOTES Sun Dec 31 09:21:34 2017 (r327424)
@@ -590,6 +590,20 @@ options STACK
#
options NUM_CORE_FILES=5
+#
+# The TSLOG option enables timestamped logging of events, especially
+# function entries/exits, in order to track the time spent by the kernel.
+# In particular, this is useful when investigating the early boot process,
+# before it is possible to use more sophisticated tools like DTrace.
+# The TSLOGSIZE option controls the size of the (preallocated, fixed
+# length) buffer used for storing these events (default: 262144 records).
+#
+# For security reasons the TSLOG option should not be enabled on systems
+# used in production.
+#
+options TSLOG
+options TSLOGSIZE=262144
+
#####################################################################
# PERFORMANCE MONITORING OPTIONS
Modified: head/sys/conf/files
==============================================================================
--- head/sys/conf/files Sun Dec 31 09:21:01 2017 (r327423)
+++ head/sys/conf/files Sun Dec 31 09:21:34 2017 (r327424)
@@ -3802,6 +3802,7 @@ kern/kern_thr.c standard
kern/kern_thread.c standard
kern/kern_time.c standard
kern/kern_timeout.c standard
+kern/kern_tslog.c optional tslog
kern/kern_umtx.c standard
kern/kern_uuid.c standard
kern/kern_xxx.c standard
Modified: head/sys/conf/options
==============================================================================
--- head/sys/conf/options Sun Dec 31 09:21:01 2017 (r327423)
+++ head/sys/conf/options Sun Dec 31 09:21:34 2017 (r327424)
@@ -67,6 +67,8 @@ EARLY_PRINTF opt_global.h
TEXTDUMP_PREFERRED opt_ddb.h
TEXTDUMP_VERBOSE opt_ddb.h
NUM_CORE_FILES opt_global.h
+TSLOG opt_global.h
+TSLOGSIZE opt_global.h
# Miscellaneous options.
ALQ
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