linux/tracepoints.h allows individual subsystems to disable their
tracepoints. Add such a knob for xfs. Disabling XFS_TRACEPOINTS
reduces the resident size of xfs.ko by about a third, or ~350 KiB.
$ size /tmp/xfs/{a,b}/xfs.ko
text data bss dec hex filename
671726 4129 632 676487 a5287 /tmp/xfs/a/xfs.ko
893192 166737 632 1060561 102ed1 /tmp/xfs/b/xfs.ko
Signed-off-by: Rasmus Villemoes <linux@xxxxxxxxxxxxxxxxxx>
---
fs/xfs/Kconfig | 9 +++++++++
fs/xfs/xfs_trace.h | 4 ++++
2 files changed, 13 insertions(+)
diff --git a/fs/xfs/Kconfig b/fs/xfs/Kconfig
index 457ac9f97377..d099e6d9f6c5 100644
--- a/fs/xfs/Kconfig
+++ b/fs/xfs/Kconfig
@@ -141,3 +141,12 @@ config XFS_ASSERT_FATAL
result in warnings.
This behavior can be modified at runtime via sysfs.
+
+config XFS_TRACEPOINTS
+ bool "XFS tracepoints"
+ default y
+ depends on XFS_FS && TRACEPOINTS
+ help
+ Say Y here to build XFS with tracepoints.
+
+ You can say N here to reduce the size of the kernel image.
diff --git a/fs/xfs/xfs_trace.h b/fs/xfs/xfs_trace.h
index 6fcc893dfc91..5fb3d5c0483e 100644
--- a/fs/xfs/xfs_trace.h
+++ b/fs/xfs/xfs_trace.h
@@ -6,6 +6,10 @@
#undef TRACE_SYSTEM
#define TRACE_SYSTEM xfs
+#ifndef CONFIG_XFS_TRACEPOINTS
+#define NOTRACE
+#endif
+
#if !defined(_TRACE_XFS_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_XFS_H
--
2.20.1
