Memory profiling for fun and profit

AllocationList::only_chain_alive_for_at_most

fn only_chain_alive_for_at_most(
    self: AllocationList,
    duration: Duration
) -> AllocationList

Returns a new AllocationList with only the allocations whose whole allocation chain was alive for at most the given duration.

This considers the whole span of time from when the allocation was first allocated (e.g. through malloc), through any potential reallocations, and until it was freed (e.g. through free) or the profiling was stopped. It will match every allocation in that chain.

For example, for the following allocation pattern:

void * a0 = malloc(size);
sleep(1);

void * a1 = realloc(a0, size + 1);
void * a2 = realloc(a2, size + 2);
free(a2);

this code:

allocations().only_chain_alive_for_at_most(s(2))

will match all three allocations (a0, a1, a2), since their whole allocation chain lived for less than two seconds.

You can use only_alive_for_at_most if you'd like to only take the lifetime of a single allocation into account.