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e09d90de8f
I am seeing disappointing clang performance on a large PowerPC64 Linux box. GetRandomNumberSeed() does a buffered read from /dev/urandom to seed its PRNG. As a result we read an entire page even though we only need 4 bytes. With every clang task reading a page worth of /dev/urandom we end up spending a large amount of time stuck on kernel spinlock. Patch by Anton Blanchard! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@255386 91177308-0d34-0410-b5e6-96231b3b80d8
llvm/lib/Support/Unix README =========================== This directory provides implementations of the lib/System classes that are common to two or more variants of UNIX. For example, the directory structure underneath this directory could look like this: Unix - only code that is truly generic to all UNIX platforms Posix - code that is specific to Posix variants of UNIX SUS - code that is specific to the Single Unix Specification SysV - code that is specific to System V variants of UNIX As a rule, only those directories actually needing to be created should be created. Also, further subdirectories could be created to reflect versions of the various standards. For example, under SUS there could be v1, v2, and v3 subdirectories to reflect the three major versions of SUS.