Andreas Kling a61f6ccc27 Kernel: Implement a simpler, bigger cache for DiskBackedFS ...

The hashmap cache was ridiculously slow and hurt us more than it helped
us. This patch replaces it with a flat memory cache that keeps up to
10'000 blocks in cache with a simple dirty bit.

The syncd task will wake up periodically and call flush_writes() on all
file systems, which now causes us to traverse the cache and write all
dirty blocks to disk.

There's a ton of room for improvement here, but this itself is already
drastically better when doing repeated GCC invocations.

2019-09-30 10:34:50 +02:00

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