linux-kernel - kbuild vs ccache

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Message-Id: <20090108040336.28B10FC3E0@magilla.sf.frob.com>
Date:	Wed,  7 Jan 2009 20:03:36 -0800 (PST)
From:	Roland McGrath <roland@...hat.com>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	linux-kernel@...r.kernel.org
Subject: kbuild vs ccache


make clean; ccache -s > before-`git describe`; make -j9; ccache -s > after-`git describe`; diff -u {before,after}-`git describe`

v2.6.28:

-cache hit                         737661
-cache miss                        979624
-called for link                    78268
+cache hit                         738093		= +432
+cache miss                        980524		= +900
+called for link                    78289		= +21
 multiple source files                373
 compile failed                      5679
 preprocessor error                  1594
-not a C/C++ file                   44512
+not a C/C++ file                   44549		= +37

1332	cacheable
58	uncacheable


v2.6.28-7485-g9e42d0c:

-cache hit                         738096		= +9
+cache hit                         738105
 cache miss                        980524		= +0
-called for link                    78293
+called for link                    79659		= +1366
 multiple source files                373
 compile failed                      5679
 preprocessor error                  1594
-not a C/C++ file                   44549		= +1384
+not a C/C++ file                   45933

9	cacheable
2750	uncacheable


What changed?


Thanks,
Roland
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