Prepare SPL repo to merge with ZFS repo

[mirror_spl.git] / config / kernel-kmem.m4

diff --git a/config/kernel-kmem.m4 b/config/kernel-kmem.m4
new file mode 100644 (file)
index 0000000..cc055e5
--- /dev/null
+++ b/config/kernel-kmem.m4
@@ -0,0 +1,58 @@
+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
+dnl # if memory was leaked.
+dnl #
+AC_DEFUN([SPL_AC_DEBUG_KMEM], [
+       AC_ARG_ENABLE([debug-kmem],
+               [AS_HELP_STRING([--enable-debug-kmem],
+               [Enable basic kmem accounting @<:@default=no@:>@])],
+               [],
+               [enable_debug_kmem=no])
+
+       AS_IF([test "x$enable_debug_kmem" = xyes],
+       [
+               KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG_KMEM"
+               DEBUG_KMEM="_with_debug_kmem"
+               AC_DEFINE([DEBUG_KMEM], [1],
+               [Define to 1 to enable basic kmem accounting])
+       ], [
+               DEBUG_KMEM="_without_debug_kmem"
+       ])
+
+       AC_SUBST(DEBUG_KMEM)
+       AC_MSG_CHECKING([whether basic kmem accounting is enabled])
+       AC_MSG_RESULT([$enable_debug_kmem])
+])
+
+dnl #
+dnl # Disabled by default it provides detailed memory tracking.  This
+dnl # feature also requires --enable-debug-kmem to be set.  When enabled
+dnl # not only will total bytes be tracked but also the location of every
+dnl # alloc and free.  When the SPL module is unloaded a list of all leaked
+dnl # addresses and where they were allocated will be dumped to the console.
+dnl # Enabling this feature has a significant impact on performance but it
+dnl # makes finding memory leaks pretty straight forward.
+dnl #
+AC_DEFUN([SPL_AC_DEBUG_KMEM_TRACKING], [
+       AC_ARG_ENABLE([debug-kmem-tracking],
+               [AS_HELP_STRING([--enable-debug-kmem-tracking],
+               [Enable detailed kmem tracking  @<:@default=no@:>@])],
+               [],
+               [enable_debug_kmem_tracking=no])
+
+       AS_IF([test "x$enable_debug_kmem_tracking" = xyes],
+       [
+               KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG_KMEM_TRACKING"
+               DEBUG_KMEM_TRACKING="_with_debug_kmem_tracking"
+               AC_DEFINE([DEBUG_KMEM_TRACKING], [1],
+               [Define to 1 to enable detailed kmem tracking])
+       ], [
+               DEBUG_KMEM_TRACKING="_without_debug_kmem_tracking"
+       ])
+
+       AC_SUBST(DEBUG_KMEM_TRACKING)
+       AC_MSG_CHECKING([whether detailed kmem tracking is enabled])
+       AC_MSG_RESULT([$enable_debug_kmem_tracking])
+])