feat(fs/mem): tarfs implementation

[fogti]

Fixes #2009.

[fogti]

TODO: what file permissions should we actually set?

[fogti]

It should now be possible to test this. Beware that the kernel doesn't support non-UTF-8 file names for in-memory filesystems, i.e. also for tarfs from the image. Of course, because it depends on unreleased hermit-entry features, this PR continues to be marked as Draft.

[github-actions]

Benchmark Results

Benchmark	Current: b5f11b4	Previous: 3448d37	Performance Ratio
startup_benchmark Build Time	135.73 s	119.62 s	1.13
startup_benchmark File Size	0.93 MB	0.87 MB	1.06
Startup Time - 1 core	0.98 s (±0.03 s)	0.95 s (±0.04 s)	1.03
Startup Time - 2 cores	0.99 s (±0.02 s)	0.97 s (±0.03 s)	1.02
Startup Time - 4 cores	1.00 s (±0.02 s)	0.97 s (±0.02 s)	1.03
multithreaded_benchmark Build Time	120.70 s	113.78 s	1.06
multithreaded_benchmark File Size	1.03 MB	0.97 MB	1.06
Multithreaded Pi Efficiency - 2 Threads	88.27 % (±8.45 %)	92.22 % (±8.48 %)	0.96
Multithreaded Pi Efficiency - 4 Threads	44.21 % (±4.03 %)	45.04 % (±3.35 %)	0.98
Multithreaded Pi Efficiency - 8 Threads	25.37 % (±2.12 %)	25.58 % (±1.95 %)	0.99
micro_benchmarks Build Time	135.58 s	303.95 s	0.45
micro_benchmarks File Size	1.03 MB	0.98 MB	1.06
Scheduling time - 1 thread	72.07 ticks (±3.22 ticks)	182.85 ticks (±32.23 ticks)	0.39
Scheduling time - 2 threads	40.94 ticks (±5.36 ticks)	103.39 ticks (±16.71 ticks)	0.40
Micro - Time for syscall (getpid)	4.18 ticks (±0.41 ticks)	11.15 ticks (±6.24 ticks)	0.37
Memcpy speed - (built_in) block size 4096	62863.73 MByte/s (±44720.89 MByte/s)	60205.86 MByte/s (±43618.30 MByte/s)	1.04
Memcpy speed - (built_in) block size 1048576	28851.51 MByte/s (±23827.23 MByte/s)	13975.87 MByte/s (±11672.94 MByte/s)	2.06
Memcpy speed - (built_in) block size 16777216	24765.03 MByte/s (±20729.71 MByte/s)	9826.16 MByte/s (±7916.47 MByte/s)	2.52
Memset speed - (built_in) block size 4096	63441.08 MByte/s (±45103.08 MByte/s)	60474.85 MByte/s (±43816.42 MByte/s)	1.05
Memset speed - (built_in) block size 1048576	29598.06 MByte/s (±24265.06 MByte/s)	14295.75 MByte/s (±11832.01 MByte/s)	2.07
Memset speed - (built_in) block size 16777216	25547.65 MByte/s (±21245.86 MByte/s)	10017.30 MByte/s (±8016.98 MByte/s)	2.55
Memcpy speed - (rust) block size 4096	57068.95 MByte/s (±42237.42 MByte/s)	55192.10 MByte/s (±39638.51 MByte/s)	1.03
Memcpy speed - (rust) block size 1048576	28713.74 MByte/s (±23852.01 MByte/s)	14842.50 MByte/s (±12990.89 MByte/s)	1.93
Memcpy speed - (rust) block size 16777216	24856.55 MByte/s (±21004.75 MByte/s)	9597.76 MByte/s (±7698.93 MByte/s)	2.59
Memset speed - (rust) block size 4096	57773.42 MByte/s (±42716.68 MByte/s)	55757.62 MByte/s (±40074.28 MByte/s)	1.04
Memset speed - (rust) block size 1048576	29461.36 MByte/s (±24281.46 MByte/s)	15091.90 MByte/s (±13083.72 MByte/s)	1.95
Memset speed - (rust) block size 16777216	25633.77 MByte/s (±21502.21 MByte/s)	9826.75 MByte/s (±7835.95 MByte/s)	2.61
alloc_benchmarks Build Time	109.18 s	299.17 s	0.36
alloc_benchmarks File Size	1.00 MB	0.95 MB	1.06
Allocations - Allocation success	100.00 %	100.00 %	1
Allocations - Deallocation success	100.00 %	100.00 %	1
Allocations - Pre-fail Allocations	100.00 %	100.00 %	1
Allocations - Average Allocation time	7014.62 Ticks (±805.59 Ticks)	17635.82 Ticks (±3715.17 Ticks)	0.40
Allocations - Average Allocation time (no fail)	7014.62 Ticks (±805.59 Ticks)	17635.82 Ticks (±3715.17 Ticks)	0.40
Allocations - Average Deallocation time	853.02 Ticks (±334.40 Ticks)	3349.50 Ticks (±849.89 Ticks)	0.25
mutex_benchmark Build Time	113.91 s	298.66 s	0.38
mutex_benchmark File Size	1.03 MB	0.97 MB	1.06
Mutex Stress Test Average Time per Iteration - 1 Threads	13.16 ns (±0.70 ns)	39.12 ns (±3.92 ns)	0.34
Mutex Stress Test Average Time per Iteration - 2 Threads	14.06 ns (±0.95 ns)	31.42 ns (±3.51 ns)	0.45

This comment was automatically generated by workflow using github-action-benchmark.