Today I made the first RedirFS performance test. It was just the Linux Vanila Kernel 2.6.19 compilation but I think that it is enough for the first sight on the RedirFS overhead. Following operations were used in the dummyflt. As you can see both pre and post callbacks are used.

static struct rfs_op_info op_info[] = {
        {RFS_REG_IOP_PERMISSION, dummyflt_fun, dummyflt_fun},
        {RFS_DIR_IOP_PERMISSION, dummyflt_fun, dummyflt_fun},
        {RFS_REG_FOP_OPEN, dummyflt_fun, dummyflt_fun},
        {RFS_DIR_FOP_OPEN, dummyflt_fun, dummyflt_fun},
        {RFS_REG_FOP_RELEASE, dummyflt_fun, dummyflt_fun},
        {RFS_DIR_FOP_RELEASE, dummyflt_fun, dummyflt_fun},
        {RFS_DIR_IOP_MKDIR, dummyflt_fun, dummyflt_fun},
        {RFS_DIR_IOP_LOOKUP, dummyflt_fun, dummyflt_fun},
        {RFS_DIR_IOP_CREATE, dummyflt_fun, dummyflt_fun},
        {RFS_REG_DOP_D_IPUT, dummyflt_fun, dummyflt_fun},
        {RFS_DIR_DOP_D_IPUT, dummyflt_fun, dummyflt_fun},
        {RFS_OP_END, NULL, NULL}
};

The dummyflt_fun does nothing just returns RFS_CONTINUE.

Tested on Linux debian 2.6.19 #1 SMP PREEMPT i686 GNU/Linux, Intel(R) Pentium(R) 4 CPU 3.00GHz HT, 512MB RAM

Run

1. make mrproper
2. make menuconfig (default configuration)
3. time make

		with RedirFS			without RedirFS
runs	1st run	2nd run	3rd run	1st run	2nd run	3rd run
real	13m43.858s	13m35.704s	13m35.896s	13m36.456s	13m27.403s	13m28.546s
user	13m2.105s	13m2.017s	13m2.969s	13m0.449s	13m0.653s	13m0.857s
sys	1m15.525s	1m16.441s	1m15.533s	1m9.248s	1m9.772s	1m9.872s

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