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authorJan Beulich <jbeulich@novell.com>2006-10-21 18:37:01 +0200
committerAndi Kleen <andi@basil.nowhere.org>2006-10-21 18:37:01 +0200
commit690a973f48b6ba2954465992c08e65059c8374fe (patch)
treeb30a59496628592233944b3f4340cdfdf9d3d5de /include/asm-generic
parentcdfce1f5714fec7b24715f569b2fee1607350a6d (diff)
downloadlinux-690a973f48b6ba2954465992c08e65059c8374fe.tar.bz2
[PATCH] x86-64: Speed up dwarf2 unwinder
This changes the dwarf2 unwinder to do a binary search for CIEs instead of a linear work. The linker is unfortunately not able to build a proper lookup table at link time, instead it creates one at runtime as soon as the bootmem allocator is usable (so you'll continue using the linear lookup for the first [hopefully] few calls). The code should be ready to utilize a build-time created table once a fixed linker becomes available. Signed-off-by: Jan Beulich <jbeulich@novell.com> Signed-off-by: Andi Kleen <ak@suse.de>
Diffstat (limited to 'include/asm-generic')
-rw-r--r--include/asm-generic/vmlinux.lds.h16
1 files changed, 16 insertions, 0 deletions
diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index 69240b52f8e1..9d0d11c180d9 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -125,6 +125,10 @@
*(__param) \
VMLINUX_SYMBOL(__stop___param) = .; \
} \
+ \
+ /* Unwind data binary search table */ \
+ EH_FRAME_HDR \
+ \
__end_rodata = .; \
. = ALIGN(4096);
@@ -157,6 +161,18 @@
*(.kprobes.text) \
VMLINUX_SYMBOL(__kprobes_text_end) = .;
+#ifdef CONFIG_STACK_UNWIND
+ /* Unwind data binary search table */
+#define EH_FRAME_HDR \
+ .eh_frame_hdr : AT(ADDR(.eh_frame_hdr) - LOAD_OFFSET) { \
+ VMLINUX_SYMBOL(__start_unwind_hdr) = .; \
+ *(.eh_frame_hdr) \
+ VMLINUX_SYMBOL(__end_unwind_hdr) = .; \
+ }
+#else
+#define EH_FRAME_HDR
+#endif
+
/* DWARF debug sections.
Symbols in the DWARF debugging sections are relative to
the beginning of the section so we begin them at 0. */