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Subject[RFC v3 0/3] vmpressure_fd: Linux VM pressure notifications
Hi all,

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.

But, conceptually, it is the exactly the same approach as in v2: three
discrete levels of the pressure -- low, medium and oom. The levels are
based on the reclaimer inefficiency index as proposed by Mel Gorman, but
userland does not see the raw index values. The description why I moved
away from reporting the raw 'reclaimer inefficiency index' can be found in
v2: http://lkml.org/lkml/2012/10/22/177

While the new API is very simple, it is still extensible (i.e. versioned).

As there are a lot of drastic changes in the API itself, I decided to just
add a new files along with vmevent, it is much easier to review it this
way (I can prepare a separate patch that removes vmevent files, if we care
to preserve the history through the vmevent tree).

Thanks,
Anton.

--
Documentation/sysctl/vm.txt | 47 +++++
arch/x86/syscalls/syscall_64.tbl | 1 +
include/linux/syscalls.h | 2 +
include/linux/vmpressure.h | 128 ++++++++++++
kernel/sys_ni.c | 1 +
kernel/sysctl.c | 31 +++
mm/Kconfig | 13 ++
mm/Makefile | 1 +
mm/vmpressure.c | 231 +++++++++++++++++++++
mm/vmscan.c | 5 +
tools/testing/vmpressure/.gitignore | 1 +
tools/testing/vmpressure/Makefile | 30 +++
tools/testing/vmpressure/vmpressure-test.c | 93 +++++++++
13 files changed, 584 insertions(+)


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