tracing/function-graph-tracer: add a new .irqentry.text section (a0343e82) · Commits · 戴 / test

Impact: let the function-graph-tracer be aware of the irq entrypoints Add a new .irqentry.text section to store the irq entrypoints functions inside the same section. This way, the tracer will be able to signal an interrupts triggering on output by recognizing these entrypoints. Also, make this section recordable for dynamic tracing. Signed-off-by:

Frederic Weisbecker <fweisbec@gmail.com> Signed-off-by:

Ingo Molnar <mingo@elte.hu>

arch/x86/kernel/vmlinux_64.lds.S

+1 −0

Original line number	Diff line number	Diff line
		@@ -35,6 +35,7 @@ SECTIONS
		SCHED_TEXT
		LOCK_TEXT
		KPROBES_TEXT
		IRQENTRY_TEXT
		*(.fixup)
		*(.gnu.warning)
		_etext = .; /* End of text section */

include/asm-generic/vmlinux.lds.h

+10 −0

Original line number	Diff line number	Diff line
		@@ -288,6 +288,16 @@
		*(.kprobes.text) \
		VMLINUX_SYMBOL(__kprobes_text_end) = .;

		#ifdef CONFIG_FUNCTION_GRAPH_TRACER
		#define IRQENTRY_TEXT \
		ALIGN_FUNCTION(); \
		VMLINUX_SYMBOL(__irqentry_text_start) = .; \
		*(.irqentry.text) \
		VMLINUX_SYMBOL(__irqentry_text_end) = .;
		#else
		#define IRQENTRY_TEXT
		#endif

		/* Section used for early init (in .S files) */
		#define HEAD_TEXT *(.head.text)

scripts/recordmcount.pl

+1 −0

Original line number	Diff line number	Diff line
		@@ -114,6 +114,7 @@ my %text_sections = (
		".text" => 1,
		".sched.text" => 1,
		".spinlock.text" => 1,
		".irqentry.text" => 1,
		);

		$objdump = "objdump" if ((length $objdump) == 0);

Admin message