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Commit a0343e82 authored by Frederic Weisbecker's avatar Frederic Weisbecker Committed by Ingo Molnar
Browse files

tracing/function-graph-tracer: add a new .irqentry.text section 



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: default avatarFrederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent f3134de6

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);