I did a kernel profile(included below) of the bootup of my custom MPC862 board
and I
noticed that __restore_flags gets a very high count. I am suprised that such a
small
assembler routine gets such a high count. __cli, _save_flags_ptr and __sti are
much lower.
A small test program with a tight select loop on fds 0,1 or 2 also makes
__restore_flags
go wild.
Anyone know why?
Also, I don't understand what all these nops in __restore_flags,
__save_flags_ptr, __cli and __sti are for. Anyone know?
Jocke
[SNIP]
3 __cli 0.0375
3 __save_flags_ptr 0.0375
32 __sti 0.4000
[SNIP]
82 memcpy 0.6833
101 zlib_inflate_blocks 0.0309
108 __flush_dcache_icache 3.0000
115 __restore_flags 1.0648
139 cpm_iic_read 0.1746
181 copy_page 2.2625
262 huft_build 0.1845
401 crc32_le 1.4120
714 zlib_inflate_fast 0.5833
6186 idled 110.4643
9649 total 0.0078
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
