Re: [RFC v3 0/3] vmpressure_fd: Linux VM pressure notifications

Hi Anton,

On Wed, Nov 7, 2012 at 12:53 PM, Anton Vorontsov anton.vorontsov@linaro.org wrote:

This is the third RFC. As suggested by Minchan Kim, the API is much simplified now (comparing to vmevent_fd):

• As well as Minchan, KOSAKI Motohiro didn't like the timers, so the timers are gone now;
• Pekka Enberg didn't like the complex attributes matching code, and so it is no longer there;
• Nobody liked the raw vmstat attributes, and so they were eliminated too.

I love the API and implementation simplifications but I hate the new ABI. It's a specialized, single-purpose syscall and bunch of procfs tunables and I don't see how it's 'extensible' to anything but VM

If people object to vmevent_fd() system call, we should consider using something more generic like perf_event_open() instead of inventing our own special purpose ABI.

Pekka