fix(mm): don't account for kernel executable memory twice

[mkroening]

physicalmem::total_memory_size() already accounts for the kernel executable.

This reduces the minimum QEMU memory amount for x86-64 hello_world from 29M to 19M.

Found this while preparing #2546.

[github-actions]

Benchmark Results

Details

Benchmark	Current: 7eb707f	Previous: 2e23902	Performance Ratio
startup_benchmark Build Time	82.70 s	80.34 s	1.03 ❗
startup_benchmark File Size	0.79 MB	0.80 MB	0.99 ❗
Startup Time - 1 core	0.75 s (±0.02 s)	0.75 s (±0.02 s)	1.00
Startup Time - 2 cores	0.75 s (±0.02 s)	0.74 s (±0.02 s)	1.02
Startup Time - 4 cores	0.75 s (±0.02 s)	0.74 s (±0.02 s)	1.01
multithreaded_benchmark Build Time	84.56 s	82.11 s	1.03 ❗
multithreaded_benchmark File Size	0.86 MB	0.86 MB	1.01 ❗
Multithreaded Pi Efficiency - 2 Threads	88.96 % (±8.36 %)	85.89 % (±6.61 %)	1.04
Multithreaded Pi Efficiency - 4 Threads	44.29 % (±4.15 %)	43.43 % (±2.56 %)	1.02
Multithreaded Pi Efficiency - 8 Threads	25.26 % (±1.78 %)	25.76 % (±1.53 %)	0.98
micro_benchmarks Build Time	83.72 s	80.40 s	1.04 ❗
micro_benchmarks File Size	0.87 MB	0.86 MB	1.01 ❗
Scheduling time - 1 thread	62.31 ticks (±3.88 ticks)	62.65 ticks (±4.06 ticks)	0.99
Scheduling time - 2 threads	35.15 ticks (±4.84 ticks)	34.08 ticks (±4.10 ticks)	1.03
Micro - Time for syscall (getpid)	3.38 ticks (±0.58 ticks)	3.45 ticks (±0.58 ticks)	0.98
Memcpy speed - (built_in) block size 4096	82949.40 MByte/s (±57364.62 MByte/s)	82448.38 MByte/s (±56997.13 MByte/s)	1.01
Memcpy speed - (built_in) block size 1048576	30289.77 MByte/s (±24476.77 MByte/s)	30585.98 MByte/s (±24707.84 MByte/s)	0.99
Memcpy speed - (built_in) block size 16777216	26805.72 MByte/s (±22103.14 MByte/s)	26340.06 MByte/s (±21720.96 MByte/s)	1.02
Memset speed - (built_in) block size 4096	83335.27 MByte/s (±57619.69 MByte/s)	82292.76 MByte/s (±56891.50 MByte/s)	1.01
Memset speed - (built_in) block size 1048576	31028.96 MByte/s (±24905.23 MByte/s)	31323.85 MByte/s (±25145.86 MByte/s)	0.99
Memset speed - (built_in) block size 16777216	27559.05 MByte/s (±22573.31 MByte/s)	27104.68 MByte/s (±22209.94 MByte/s)	1.02
Memcpy speed - (rust) block size 4096	74441.43 MByte/s (±51653.66 MByte/s)	74097.96 MByte/s (±51811.44 MByte/s)	1.00
Memcpy speed - (rust) block size 1048576	30319.61 MByte/s (±24580.54 MByte/s)	30361.60 MByte/s (±24602.37 MByte/s)	1.00
Memcpy speed - (rust) block size 16777216	27216.98 MByte/s (±22499.24 MByte/s)	27625.34 MByte/s (±22806.88 MByte/s)	0.99
Memset speed - (rust) block size 4096	74458.24 MByte/s (±51664.25 MByte/s)	74373.47 MByte/s (±51976.48 MByte/s)	1.00
Memset speed - (rust) block size 1048576	31046.46 MByte/s (±24991.67 MByte/s)	31110.89 MByte/s (±25033.24 MByte/s)	1.00
Memset speed - (rust) block size 16777216	27977.74 MByte/s (±22967.72 MByte/s)	28386.93 MByte/s (±23265.03 MByte/s)	0.99
alloc_benchmarks Build Time	77.68 s	74.76 s	1.04 ❗
alloc_benchmarks File Size	0.87 MB	0.87 MB	1.00 ❗
Allocations - Allocation success	91.35 %	91.31 %	1.00 ❗
Allocations - Deallocation success	100.00 %	100.00 %	1
Allocations - Pre-fail Allocations	61.53 %	61.44 %	1.00 ❗
Allocations - Average Allocation time	4553.57 Ticks (±150.62 Ticks)	5860.58 Ticks (±98.43 Ticks)	0.78 ❗
Allocations - Average Allocation time (no fail)	5283.28 Ticks (±140.94 Ticks)	6554.81 Ticks (±92.86 Ticks)	0.81 ❗
Allocations - Average Deallocation time	1058.46 Ticks (±160.13 Ticks)	1805.01 Ticks (±250.35 Ticks)	0.59 ❗
mutex_benchmark Build Time	81.55 s	79.82 s	1.02 ❗
mutex_benchmark File Size	0.87 MB	0.86 MB	1.01 ❗
Mutex Stress Test Average Time per Iteration - 1 Threads	12.30 ns (±0.46 ns)	12.10 ns (±0.41 ns)	1.02
Mutex Stress Test Average Time per Iteration - 2 Threads	42.42 ns (±2.05 ns)	40.26 ns (±1.68 ns)	1.05

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