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author | Vineet Gupta <vgupta@synopsys.com> | 2016-09-20 02:42:25 +0300 |
---|---|---|
committer | Vineet Gupta <vgupta@synopsys.com> | 2016-10-01 00:48:22 +0300 |
commit | 86effd0dc675c36caed7b954d7f4f63b77c353b5 (patch) | |
tree | 618b2e5e1bed7286aead4cb7c4fe83157bdb583c /arch/arc/lib/memset-archs.S | |
parent | 5a205a32ffccf6e720a2d2b3aee44b16619016a6 (diff) | |
download | linux-86effd0dc675c36caed7b954d7f4f63b77c353b5.tar.xz |
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>
Diffstat (limited to 'arch/arc/lib/memset-archs.S')
-rw-r--r-- | arch/arc/lib/memset-archs.S | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/arch/arc/lib/memset-archs.S b/arch/arc/lib/memset-archs.S index 365b18364815..62ad4bcb841a 100644 --- a/arch/arc/lib/memset-archs.S +++ b/arch/arc/lib/memset-archs.S @@ -10,7 +10,7 @@ #undef PREALLOC_NOT_AVAIL -ENTRY(memset) +ENTRY_CFI(memset) prefetchw [r0] ; Prefetch the write location mov.f 0, r2 ;;; if size is zero @@ -112,11 +112,11 @@ ENTRY(memset) j [blink] -END(memset) +END_CFI(memset) -ENTRY(memzero) +ENTRY_CFI(memzero) ; adjust bzero args to memset args mov r2, r1 b.d memset ;tail call so need to tinker with blink mov r1, 0 -END(memzero) +END_CFI(memzero) |