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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@parasite.cc> Acked-by: Ian Jackson <ian.jackson@eu.citrix.com> Committed-by: Ian Campbell <ian.campbell@citrix.com>