[PATCH -perfbook 4/5] cpu/overhead: Add "samepage=true" option to short VerbatimN env

Page/column break in the middle of this snippet should better be
avoided.

Signed-off-by: Akira Yokosawa <[email protected]>
---
 cpu/overview.tex | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cpu/overview.tex b/cpu/overview.tex
index eedf8491..8a184f3c 100644
--- a/cpu/overview.tex
+++ b/cpu/overview.tex
@@ -255,7 +255,7 @@ as described in the next section.
 In the meantime, consider the following simple lock-based \IX{critical
 section}:
 
-\begin{VerbatimN}
+\begin{VerbatimN}[samepage=true]
 spin_lock(&mylock);
 a = a + 1;
 spin_unlock(&mylock);
-- 
2.43.0