Re: [Xen-devel] [PATCH] xentop.c: Change curses painting behavior to avoid flicker

[Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>]

Jason McCarver writes ("[PATCH] xentop.c: Change curses painting behavior to 
avoid flicker"):
> Currently, xentop calls clear() before drawing the screen and calling
> refresh().  This causes the entire screen to be repainted from scratch
> on each call to refresh().  It is inefficient and causes visible flicker
> when using xentop.
> 
> This patch fixes this by calling erase() instead of clear() which overwrites
> the current screen with blanks instead.  The screen is then drawn as usual
> in the top() function and refresh() is called.  This method allows curses
> to only repaint the characters that have changed since the last call
> to refresh(), thus avoiding the flicker and sending fewer characters to
> the terminal.
> 
> In the event the screen becomes corrupted, this patch accepts a CTRL-L
> keystroke from the user which will call clear() and force a repaint of
> the entire screen.
> 
> Signed-off-by: Jason McCarver <slam@xxxxxxxxxxx>

Acked-by: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>

However, I think this needs to wait for Xen 4.3.  We are currently in
the freeze for the 4.2 release.

Ian.

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