[Fontconfig-bugs] [Bug 94427] Performance regression in git compared 2.11

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94427

--- Comment #6 from Peter <fontconfigbugs at uninformativ.de> ---
To be more precise, the commit mentioned above adds a call to FcDirScanOnly()
which causes all the stat() calls Antonio has seen. FcDirScanOnly() will
*always* be called, even if the cache turns out to be perfectly valid.

To give you some more numbers, a "time fc-list" in a terminal went from ~30ms
with fontconfig 2.11.1 to ~200ms with fontconfig 2.11.94. As a result,
seemingly "simple" applications like dmenu show a noticeable lag on startup.
I'm on an i7-3770 with 32GB RAM, so neither CPU speed nor the size of IO cache
should be an issue here.

I'm not familiar with fontconfig's code, but I noticed that FcCacheDirsValid()
gets called 18 times. Is that neccessary? I added some ugly static variables to
make fontconfig "cache" the first return value of FcCacheDirsValid() and I'm
back at my ~30ms. Thus, *one* call to FcDirScanOnly() is just fine.

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