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SubjectRe: [PATCH 0/8][for -mm] mem_notify v6

Interesting patch series (I am being yuppie and reading this thread
from my iPhone on a treadmill at the gym - so further comments later).
I think that this is broadly along the lines that I was thinking, but
this should be an RFC only patch series for now.

Some initial questions:

Where is the netlink interface? Polling an FD is so last century :)

What testing have you done?

Still, it is good to start with some code - eventually we might just
have a full reservation API created. Rik and I and others have bounced
ideas around for a while and I hope we can pitch in. I will play with
these patches later.


On Feb 9, 2008, at 10:19, "KOSAKI Motohiro" <
> wrote:

> Hi
> The /dev/mem_notify is low memory notification device.
> it can avoid swappness and oom by cooperationg with the user process.
> the Linux Today article is very nice description. (great works by
> Jake Edge)
> <quoted>
> When memory gets tight, it is quite possible that applications have
> memory
> allocated—often caches for better performance—that they could fre
> e.
> After all, it is generally better to lose some performance than to
> face the
> consequences of being chosen by the OOM killer.
> But, currently, there is no way for a process to know that the
> kernel is
> feeling memory pressure.
> The patch provides a way for interested programs to monitor the /dev/
> mem_notify
> file to be notified if memory starts to run low.
> </quoted>
> You need not be annoyed by OOM any longer :)
> please any comments!
> patch list
> [1/8] introduce poll_wait_exclusive() new API
> [2/8] introduce wake_up_locked_nr() new API
> [3/8] introduce /dev/mem_notify new device (the core of this
> patch series)
> [4/8] memory_pressure_notify() caller
> [5/8] add new mem_notify field to /proc/zoneinfo
> [6/8] (optional) fixed incorrect shrink_zone
> [7/8] ignore very small zone for prevent incorrect low mem
> notify.
> [8/8] support fasync feature
> related discussion:
> --------------------------------------------------------------
> LKML OOM notifications requirement discussion
> OOM notifications patch [Marcelo Tosatti]
> mem notifications v3 [Marcelo Tosatti]
> Thrashing notification patch [Daniel Spang]
> mem notification v4
> mem notification v5
> Changelog
> -------------------------------------------------
> v5 -> v6 (by KOSAKI Motohiro)
> o rebase to 2.6.24-mm1
> o fixed thundering herd guard formula.
> v4 -> v5 (by KOSAKI Motohiro)
> o rebase to 2.6.24-rc8-mm1
> o change display order of /proc/zoneinfo
> o ignore very small zone
> o support fcntl(F_SETFL, FASYNC)
> o fixed some trivial bugs.
> v3 -> v4 (by KOSAKI Motohiro)
> o rebase to 2.6.24-rc6-mm1
> o avoid wake up all.
> o add judgement point to __free_one_page().
> o add zone awareness.
> v2 -> v3 (by Marcelo Tosatti)
> o changes the notification point to happen whenever
> the VM moves an anonymous page to the inactive list.
> o implement notification rate limit.
> v1(oom notify) -> v2 (by Marcelo Tosatti)
> o name change
> o notify timing change from just swap thrashing to
> just before thrashing.
> o also works with swapless device.
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