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authorRichard Purdie <richard.purdie@linuxfoundation.org>2013-03-14 17:26:20 +0000
committerRichard Purdie <richard.purdie@linuxfoundation.org>2013-03-18 21:26:40 +0000
commitadd11fa1abfc51f1a793c84f02cd7d85d793fe14 (patch)
treee58176a867d272a57d91f61e2f954fc0249d007e /meta/recipes-bsp
parentcec0102647e3f2c93de5125c1de2436b4b787bdd (diff)
downloadpoky-add11fa1abfc51f1a793c84f02cd7d85d793fe14.tar.gz
package: Add cachedpath optimisation
Currently, various standard library operations like os.walk(), os.path.isdir() and os.path.islink() each call stat or lstat which involves a syscall into the kernel. There is no caching since they could conceivably have changed on disk. The result is that for something like the do_package task of the kernel we're spending over two minutes making 868,000 individual stat calls for 23,000 files. This is suboptimal. This patch adds lib/oe/cachedpath.py which are a set of replacement functions for these operations which use cached stat data rather than hitting the kernel each time. It gives a nice performance improvement halving the build time of the kernel do_package. (From OE-Core rev: 556dee0c4d6d8a87c0cddbd2f60fe5917d009f18) Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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