it would be very nice to additionally approximate the malloc overhead, probably via pluggable code. see also measure_malloc_overhead in the heaptrack sources.
Description
Description
Comment Actions
On a 32bit machine:
requested | actual | overhead 1 | 16 | 15 2 | 16 | 14 3 | 16 | 13 4 | 16 | 12 6 | 16 | 10 8 | 16 | 8 12 | 16 | 4 16 | 24 | 8 24 | 32 | 8 32 | 40 | 8 48 | 56 | 8 64 | 72 | 8 96 | 104 | 8 128 | 136 | 8 192 | 200 | 8 256 | 264 | 8 384 | 392 | 8 512 | 520 | 8 768 | 776 | 8 1024 | 1032 | 8 1536 | 1544 | 8 2048 | 2056 | 8 3072 | 3080 | 8 4096 | 4104 | 8 6144 | 6152 | 8 8192 | 8200 | 8 12288 | 12296 | 8 16384 | 16392 | 8 24576 | 24584 | 8 32768 | 32776 | 8 49152 | 49160 | 8 65536 | 65544 | 8 98304 | 98312 | 8 131072 | 131080 | 8
On a 64bit machine:
requested | actual | overhead 1 | 32 | 31 2 | 32 | 30 3 | 32 | 29 4 | 32 | 28 6 | 32 | 26 8 | 32 | 24 12 | 32 | 20 16 | 32 | 16 24 | 32 | 8 32 | 48 | 16 48 | 64 | 16 64 | 80 | 16 96 | 112 | 16 128 | 144 | 16 192 | 208 | 16 256 | 272 | 16 384 | 400 | 16 512 | 528 | 16 768 | 784 | 16 1024 | 1040 | 16 1536 | 1552 | 16 2048 | 2064 | 16 3072 | 3088 | 16 4096 | 4112 | 16 6144 | 6160 | 16 8192 | 8208 | 16 12288 | 12304 | 16 16384 | 16400 | 16 24576 | 24592 | 16 32768 | 32784 | 16 49152 | 49168 | 16 65536 | 65552 | 16 98304 | 98320 | 16 131072 | 131088 | 16
Comment Actions
additionally, we could try to use seccomp(-bpf) to get notified about mmap syscalls via SIGSYS, but I'm not sure whether we get access to the syscall args from the interrupt handler