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4 Commits

Author SHA1 Message Date
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
Vineet Gupta
ac506b7f22 ARCv2: lib: memcpy: use local symbols 
Otherwise perf profiles don't charge tme to memcpy

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
 2015-11-03 17:33:00 +05:30
Vineet Gupta
21481f2cfe ARCv2: lib: memcpy: Missing PREFETCHW 
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
 2015-07-20 17:27:35 +03:00
Claudiu Zissulescu
1f7e3dc0ba ARCv2: optimised string/mem lib routines 
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
 2015-06-22 14:06:56 +05:30