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 _______________________________________________ svn-src-all@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
