diff options
| author | Brian Behlendorf <[email protected]> | 2012-01-20 16:39:12 -0800 |
|---|---|---|
| committer | Brian Behlendorf <[email protected]> | 2012-02-02 11:27:54 -0800 |
| commit | 4b2220f0b937018b79154ac368c845e6176a8a66 (patch) | |
| tree | 07877c960d2d94a913e8d38c0421e21bacb3592c /config/spl-build.m4 | |
| parent | 3c6ed5410beb7a4f9e0c042229eb63c4c11a5fc9 (diff) | |
Add --enable-debug-log configure option
Until now the notion of an internal debug logging infrastructure
was conflated with enabling ASSERT()s. This patch clarifies things
by cleanly breaking the two subsystem apart. The result of this
is the following behavior.
--enable-debug - Enable/disable code wrapped in ASSERT()s.
--disable-debug ASSERT()s are used to check invariants and
are never required for correct operation.
They are disabled by default because they
may impact performance.
--enable-debug-log - Enable/disable the debug log infrastructure.
--disable-debug-log This infrastructure allows the spl code and
its consumer to log messages to an in-kernel
log. The granularity of the logging can be
controlled by a debug mask. By default the
mask disables most debug messages resulting
in a negligible performance impact. Because
of this the debug log is enabled by default.
Signed-off-by: Brian Behlendorf <[email protected]>
Diffstat (limited to 'config/spl-build.m4')
| -rw-r--r-- | config/spl-build.m4 | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/config/spl-build.m4 b/config/spl-build.m4 index a20ee38d1..205eb6bc5 100644 --- a/config/spl-build.m4 +++ b/config/spl-build.m4 @@ -19,6 +19,7 @@ AC_DEFUN([SPL_AC_CONFIG_KERNEL], [ AC_SUBST(KERNELCPPFLAGS) SPL_AC_DEBUG + SPL_AC_DEBUG_LOG SPL_AC_DEBUG_KMEM SPL_AC_DEBUG_KMEM_TRACKING SPL_AC_ATOMIC_SPINLOCK @@ -486,6 +487,33 @@ AC_DEFUN([SPL_AC_DEBUG], [ ]) dnl # +dnl # Enabled by default it provides a basic debug log infrastructure. +dnl # Each subsystem registers itself with a name and logs messages +dnl # using predefined types. If the debug mask it set to allow the +dnl # message type it will be written to the internal log. The log +dnl # can be dumped to a file by echoing 1 to the 'dump' proc entry, +dnl # after dumping the log it must be decoded using the spl utility. +dnl # +dnl # echo 1 >/proc/sys/kernel/spl/debug/dump +dnl # spl /tmp/spl-log.xxx.yyy /tmp/spl-log.xxx.yyy.txt +dnl # +AC_DEFUN([SPL_AC_DEBUG_LOG], [ + AC_ARG_ENABLE([debug-log], + [AS_HELP_STRING([--enable-debug-log], + [Enable basic debug logging @<:@default=yes@:>@])], + [], + [enable_debug_log=yes]) + + AS_IF([test "x$enable_debug_log" = xyes], + [AC_DEFINE([DEBUG_LOG], [1], + [Define to 1 to enable basic debug logging]) + KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG_LOG"]) + + AC_MSG_CHECKING([whether basic debug logging is enabled]) + AC_MSG_RESULT([$enable_debug_log]) +]) + +dnl # dnl # Enabled by default it provides a minimal level of memory tracking. dnl # A total count of bytes allocated is kept for each alloc and free. dnl # Then at module unload time a report to the console will be printed |