On Wed, Feb 14, 2024 at 03:46:33PM +0100, Michal Hocko wrote: > On Wed 14-02-24 01:20:20, Johannes Weiner wrote: > [...] > > I agree we should discuss how the annotations are implemented on a > > technical basis, but my take is that we need something like this. > > I do not think there is any disagreement on usefulness of a better > memory allocation tracking. At least for me the primary problem is the > implementation. At LFSMM last year we have heard that existing tracing > infrastructure hasn't really been explored much. Cover letter doesn't > really talk much about those alternatives so it is really hard to > evaluate whether the proposed solution is indeed our best way to > approach this. Michal, we covered this before. To do this with tracing you'd have to build up data structures separately, in userspace, that would mirror the allocator's data structures; you would have to track every single allocation so that you could match up the free event to the place it was allocated. Even if it could be built, which I doubt, it'd be completely non viable because the performance would be terrible. Like I said, we covered all this before; if you're going to spend so much time on these threads you really should be making a better attempt at keeping up with what's been talked about.
