Viewing profile — cdown

This is actually something we're actively working on! Nhat Pham is working on a patch series called "virtual swap space" ( https://lwn.net/Articles/1059201/ ) which decouples zswap…

There are quite a few numbers in the article, although of course I'm happy to hear any more you'd like presented. * A counterintuitive 25% reduction in disk writes at Instagram aft…

Thank you for reading and your critique! What you're describing is definitely a real problem, but I'd challenge slightly and suggest the outcome is usually the inverse of what you …

Hey there! Article author here -- just found out this was posted here and going through the comments :-) One of the earliest test versions of my patch actually did inode reuse usin…

My e-mail address is already public from my kernel commits and upstream work. :-)

Hey! Facebook engineer here. If you have it, can you send me the User-Agent for these requests? That would definitely help speed up narrowing down what's happening here. If you can…

I had no idea anyone would find this so fast, so I thought it would be safe to change the url to match the final title before posting anywhere -- how wrong I was. It's back now. Th…

There are some systems which are memory-bound by nature, not as a consequence of poor optimisation, so it's not really as simple as "needed" or "not needed". As a basic example, in…

I mean, it really depends on your application how non-trivial the performance improvement will be, but this statement isn't theoretical -- memory bound systems are a major case whe…

> how much time did I spend waiting to swap-in a page You can do this with eBPF/BCC by using funclatency ( https://github.com/iovisor/bcc/blob/master/tools/funclatency... ) to trac…

> Once desktop systems and applications support required APIs to handle saving state before being shut down. SIGTERM and friends? :-) If your application is just dropping state on …

> I never saw programs I would actually want to use try to allocate that much What about applications that have memory-bound performance characteristics? In these cases, saving a b…

One problem with relying on the OOM killer in general is that the OOM killer is only invoked in moments of extreme starvation of memory. We really have no ability currently in Linu…

> In my experience, a misbehaving linux system that's out of RAM and has swap to spare will be unusably slow. Yeah, this is basically the main drawback of swap. I tried to address …

Here's the technical whitepaper: https://fbnewsroomus.files.wordpress.com/2016/07/secret_conv...

If you really want to store a "lifetime of photos", you should probably consider having a better long-term backup strategy than just putting it in locations that are managed by a s…