Low memory killer problem

[<zhiyuan_zhu@htc.com>]

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Loop Linux-mm, thanks.
I want to know, why lowmemory killer not included ION free memory?
Thnanks.


From: Zhiyuan Zhu(朱志遠)
Sent: Friday, May 12, 2017 4:56 PM
To: vinmenon@codeaurora.org
Cc: Kyle Lin(林昭凱); Zhiyuan Zhu(朱志遠)
Subject: Low memory killer problem

Dear Vinmenon,

I found a part of ION memory will be return to system in android platform,
But these memorys  can’t accounted in low-memory-killer strategy.
…
And I also found ION memory comes from, kmalloc/vmalloc/alloc pages/reserved memory.
What affect if account these memorys for free?
Many thanks.

…
Lowmemory killer strategy
af6c02b83 (Vinayak Menon      2015-08-27 16:29:37 +0530 418)            global_page_state(NR_FILE_PAGES) + zcache_pages())
af6c02b83 (Vinayak Menon      2015-08-27 16:29:37 +0530 419)            other_file = global_page_state(NR_FILE_PAGES) + zcache_pages() -
058dbde92 (Vinayak Menon      2014-02-27 00:36:22 +0530 420)                                            global_page_state(NR_SHMEM) -
058dbde92 (Vinayak Menon      2014-02-27 00:36:22 +0530 422)                                            total_swapcache_pages();



Meminfo example
$ adb shell cat /proc/meminfo
MemTotal:        3805312 kB
MemFree:         1446220 kB
MemAvailable:    2388384 kB
Buffers:           16796 kB
Cached:          1190868 kB
…
IonTotal:         224252 kB
IonInUse:         199108 kB



Thanks
BR
Zhiyuan zhu

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