D
Deleted member 143446
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I want to share what I had did "released" some burden of my PC.
After collecting and anslysing system profiler tool logs, I noticed these consumes the highest CPU usages are in freeze times :
1. %52.60 - Firefox
2. %34.80 - kernel
Under kernel I found these :
asm_exc_page_fault
- exc_page_fault
-- do_user_addr_fault
--- handle_mm_fault
----__do_fault
-----filemap_fault
-------page_cache_ra_unbounded
-------read_pages
--------squashfs_readpage
----------squashfs_readpage_block
----------squashfs_cache_get
----------read_indexes
----------squashfs_read_metadata
----------squashfs_copy_cache
Those listed aboves are the breakdown structure of the process under kernel title.
So, I found from internet that, squashfs_readpage is responsible for writing to tmpfs(temporary file system) and it can cause high cpu usage. Someone deals with but s/he did not write how to, so I leave that alone.
Today I found there is also one high cpu user :
khugepage
I looked those pages :
1. https://www.kernel.org/doc/html/latest/admin-guide/mm/transhuge.html
2. https://access.redhat.com/solutions/46111
3. https://docs.oracle.com/en/database...tml#GUID-02E9147D-D565-4AF8-B12A-8E6E9F74BEEA
As far as I understand, users have options to enable or disable it, if their applications do not require it, because it is not like hugepage process which is a system-wide requirement and can not be closed. I do not have such applications so I want to disable it. So, I tried to change it to never by using command :
sudo echo never >/sys/kernel/mm/transparent_hugepage/enabled
but it gives me error :
bash: /sys/kernel/mm/transparent_hugepage/enabled: Access restricted
Why did such error appear?
How can I disable it?
If I want to kill it, is it safe to kill khugepage instantly by using kill command(I did not try it yet)? Can anybody guide me about this topic?
After collecting and anslysing system profiler tool logs, I noticed these consumes the highest CPU usages are in freeze times :
1. %52.60 - Firefox
2. %34.80 - kernel
Under kernel I found these :
asm_exc_page_fault
- exc_page_fault
-- do_user_addr_fault
--- handle_mm_fault
----__do_fault
-----filemap_fault
-------page_cache_ra_unbounded
-------read_pages
--------squashfs_readpage
----------squashfs_readpage_block
----------squashfs_cache_get
----------read_indexes
----------squashfs_read_metadata
----------squashfs_copy_cache
Those listed aboves are the breakdown structure of the process under kernel title.
So, I found from internet that, squashfs_readpage is responsible for writing to tmpfs(temporary file system) and it can cause high cpu usage. Someone deals with but s/he did not write how to, so I leave that alone.
Today I found there is also one high cpu user :
khugepage
I looked those pages :
1. https://www.kernel.org/doc/html/latest/admin-guide/mm/transhuge.html
2. https://access.redhat.com/solutions/46111
3. https://docs.oracle.com/en/database...tml#GUID-02E9147D-D565-4AF8-B12A-8E6E9F74BEEA
As far as I understand, users have options to enable or disable it, if their applications do not require it, because it is not like hugepage process which is a system-wide requirement and can not be closed. I do not have such applications so I want to disable it. So, I tried to change it to never by using command :
sudo echo never >/sys/kernel/mm/transparent_hugepage/enabled
but it gives me error :
bash: /sys/kernel/mm/transparent_hugepage/enabled: Access restricted
Why did such error appear?
How can I disable it?
If I want to kill it, is it safe to kill khugepage instantly by using kill command(I did not try it yet)? Can anybody guide me about this topic?