A question about "Software rendering for gnome-shell"

[mwesten]

On 02/23/2012 09:54 AM, Adam Jackson wrote:
> In the non-steady-state, though, the current implementation is known
>  to be incredibly memcpy-heavy.  Fixes coming soon, beta should be
> much better I hope.  If you want to collect some data about where CPU
> time is being spent, 'perf record' against the X server or
> gnome-shell (with debuginfo installed) and then 'perf report' should
>  be enlightening.  I suspect you'll find the vast majority of the
> time spent in memcpy in one form or another (pixman or fb blit,
> copying data into and out of the kernel across the unix socket,
> etc).
>
> - ajax
>

I set this up on the Alpha release and the results are below.  I'm 
assuming there's something wrong with that top entry, but I don't know 
how to fix it.

-Mike

Events: 50K cycles

  55.99%  gnome-shell  perf-6425.map                       [.] 0x19b99e
   4.91%  gnome-shell  swrast_dri.so                       [.]
lp_tile_b8g8r8x8_unorm_swizzle_4ub
   3.50%  gnome-shell  swrast_dri.so                       [.]
lp_tile_b8g8r8x8_unorm_unswizzle_4ub
   2.60%  gnome-shell  libX11.so.6.3.0                     [.] _XPutPixel32
   2.57%  gnome-shell  libX11.so.6.3.0                     [.] _XGetPixel32
   2.40%  gnome-shell  [kernel.kallsyms]                   [k]
__copy_from_user_ll
   1.97%  gnome-shell  swrast_dri.so                       [.]
lp_rast_clear_zstencil
   1.62%  gnome-shell  [kernel.kallsyms]                   [k]
get_page_from_freelist
   1.49%  gnome-shell  [kernel.kallsyms]                   [k] 
__lock_acquire
   1.03%  gnome-shell  libc-2.15.so                        [.] 
__memmove_ia32
   0.97%  gnome-shell  [kernel.kallsyms]                   [k]
native_sched_clock
   0.85%  gnome-shell  libX11.so.6.3.0                     [.] _XSetImage
   0.69%  gnome-shell  libc-2.15.so                        [.] __memcpy_ia32
   0.66%  gnome-shell  [kernel.kallsyms]                   [k]
sched_clock_local
   0.64%  gnome-shell  [kernel.kallsyms]                   [k]
__kernel_text_address
   0.63%  gnome-shell  libX11.so.6.3.0                     [.]
__x86.get_pc_thunk.bx
   0.52%  gnome-shell  swrast_dri.so                       [.]
lp_rast_shade_tile