sql server 2012 MEMORYCLERK_SQLCLR takes most memory

we have a sql 2012 server, and recently we experience periodically page life downgrades to 0 problem. The frequency is every a few hours.
When I checked memory usage, MEMORYCLERK_SQLCLR takes most of the memory, more than MEMORYCLERK_SQLBUFFERPOOL, the details is in attached picture.

And I used profiler to check what is running in SQL Server while page life suddenly downgrades to 0, and I found only log shipping backup processes are running at the time.. Is it log shipping caused problem? Though the log backup running at the time is for very small database (under 200MB)... The proflier and performance data screenshot is also attached.

Appreciate for your kindly help, any idea is appreciated a lot!
memory-usage.jpg
Profiler-perf.jpg
xuewei shiDBAAsked:
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Vitor MontalvãoConnect With a Mentor MSSQL Senior EngineerCommented:
Hi xuewei,

This is todays result?
For now it's only having the highest amount of memory reserved, not used.
Do you remember that long running SP that you showed me in another question? I think it might uses CLR as I can't figure any other option here. Unfortunaly the only way to clean MEMORYCLERK_SQLCLR  is restarting the service.
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xuewei shiDBAAuthor Commented:
Good day Vitor! Yes this is today's result. Now still about 12GB is reserved for CLR, so does it mean this 12GB memory cannot be used by SQL buffer pool, is my understanding right? Thank you!
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Vitor MontalvãoMSSQL Senior EngineerCommented:
I'm afraid that's correct.
For now are you having performance issues? If not, wait for the next reboot and check again the memoryclerk.
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xuewei shiDBAAuthor Commented:
Thank you so much Vitor for your help!!
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