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linux-next/arch/arc
Vineet Gupta 86effd0dc6 ARC: dw2 unwind: enable cfi pseudo ops in string lib
This uses a new set of annoations viz. ENTRY_CFI/END_CFI to enabel cfi
ops generation.

Note that we didn't change the normal ENTRY/EXIT as we don't actually
want unwind info in the trap/exception/interrutp handlers which use
these, as unwinder then gets confused (it keeps recursing vs. stopping).
Semantically these are leaf routines and unwinding should stop when it
hits those routines.

Before
------

    28.52%     1.19%          9929  hackbench  libuClibc-1.0.17.so   [.] __write_nocancel
            |
            ---__write_nocancel
               |--8.95%--EV_Trap
               |           --8.25%--sys_write
               |                     |--3.93%--sock_write_iter
     ...
               |--2.62%--memset   <==== [LEAF entry as no unwind info]
                         ^^^^^^

After
-----

    29.46%     1.24%         13622  hackbench  libuClibc-1.0.17.so   [.] __write_nocancel
            |
            ---__write_nocancel
               |--9.31%--EV_Trap
               |           --8.62%--sys_write
               |                     |--4.17%--sock_write_iter
     ...
               |--6.19%--sys_write
               |           --6.19%--sock_write_iter
               |                     unix_stream_sendmsg
               |                     |--1.62%--sock_alloc_send_pskb
               |                     |--0.89%--sock_def_readable
               |                     |--0.88%--_raw_spin_unlock_irqrestore
               |                     |--0.69%--memset
               |                     |         ^^^^^^     <==== [now in proper callframe]
               |                     |
               |                      --0.52%--skb_copy_datagram_from_iter

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2016-09-30 14:48:22 -07:00
..
boot ARCv2: Add support for ZeBu Emulation platform for HS cores 2016-09-30 14:48:15 -07:00
configs ARCv2: Add support for ZeBu Emulation platform for HS cores 2016-09-30 14:48:15 -07:00
include ARC: dw2 unwind: add infrastructure for adding cfi pseudo ops to asm 2016-09-30 14:48:22 -07:00
kernel ARC: dw2 unwind: enable cfi pseudo ops in string lib 2016-09-30 14:48:22 -07:00
lib ARC: dw2 unwind: enable cfi pseudo ops in string lib 2016-09-30 14:48:22 -07:00
mm ARCv2: Support dynamic peripheral address space in HS38 rel 3.0 cores 2016-09-30 14:48:17 -07:00
oprofile ARC: OProfile support 2013-02-15 23:16:00 +05:30
plat-axs10x ARC updates for 4.7-rc1 2016-05-19 09:46:18 -07:00
plat-eznps ARC: [plat-eznps] Use dedicated identity auxiliary register. 2016-05-09 09:32:33 +05:30
plat-sim ARCv2: Add support for ZeBu Emulation platform for HS cores 2016-09-30 14:48:15 -07:00
plat-tb10x arc: select GPIOLIB directly 2016-04-26 14:07:59 +02:00
Kbuild ARC: Build system: Makefiles, Kconfig, Linker script 2013-02-11 20:00:25 +05:30
Kconfig ARCv2: Implement atomic64 based on LLOCKD/SCONDD instructions 2016-09-30 14:48:17 -07:00
Kconfig.debug ARC: With earlycon in use, retire EARLY_PRINTK 2015-05-11 11:20:21 +05:30
Makefile ARC: dw2 unwind: add infrastructure for adding cfi pseudo ops to asm 2016-09-30 14:48:22 -07:00