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macos – Removing free partition on Macbook Macintosh HD

Let me tell you the story to understand the problem.

I installed Ubuntu 20.04 on my mac as the second OS. Later I decided to delete it, and being not good in all this stuff, I decided to just remove the 30gb partition I gave for Ubuntu. However, EFI partition was left.

I downloaded Paragon and erased this EFI. But it is not merged still with my Macintosh HD!

Paragon - disks structure

So my question is how to merge it (include literally the 314.57 Mb partition) with my hard disk (APFS-container)?

I tried to format it as HFS+ and then tried to make it APSF but my system felt and I had to install macOS again.

P.S. Disk Utility says that there is a trouble and to repair it, I need to go to recovery mode. But when I go to RM, it says the same thing – even though I turned off filevault as some sources say.

I will be very thankful to you for your response!

linux – enough free pages but high number of major page faults and page reclaims

We find that for some servers io disk read is very high. We also notice that there are many major page faults on those servers. But we checked the /proc/zoneinfo, there are enough free pages. Here is the content of /proc/zoneinfo:

pages free     3913507
        min      11333
        low      14166
        high     16999
        scanned  0
        spanned  16777216
        present  16777216
        managed  16507043
    nr_free_pages 3913507

We also use “perf” to monitor the event of “mm_filemap_delete_from_page_cache”. Here is the result of perf:

7fff81189dd0 __delete_from_page_cache ((kernel.kallsyms))
        7fff8119b771 __remove_mapping ((kernel.kallsyms))
        7fff8119c8e8 shrink_page_list ((kernel.kallsyms))
        7fff8119d45a shrink_inactive_list ((kernel.kallsyms))
        7fff8119df55 shrink_lruvec ((kernel.kallsyms))
        7fff8119e376 shrink_zone ((kernel.kallsyms))
        7fff8119e880 do_try_to_free_pages ((kernel.kallsyms))
        7fff8119ed6c try_to_free_pages ((kernel.kallsyms))
        7fff816ac515 __alloc_pages_slowpath ((kernel.kallsyms))
        7fff811932d5 __alloc_pages_nodemask ((kernel.kallsyms))
        7fff811d7a68 alloc_pages_current ((kernel.kallsyms))
        7fff811e27f5 new_slab ((kernel.kallsyms))
        7fff811e40fc ___slab_alloc ((kernel.kallsyms))
        7fff816adaf1 __slab_alloc ((kernel.kallsyms))
        7fff811e609b kmem_cache_alloc ((kernel.kallsyms))
        7fff812778ed proc_alloc_inode ((kernel.kallsyms))
        7fff812234d0 alloc_inode ((kernel.kallsyms))
        7fff81225771 new_inode_pseudo ((kernel.kallsyms))
        7fff812257d9 new_inode ((kernel.kallsyms))
        7fff8127bc1e proc_pid_make_inode ((kernel.kallsyms))
        7fff812800e5 proc_fd_instantiate ((kernel.kallsyms))
        7fff8127c54c proc_fill_cache ((kernel.kallsyms))
        7fff812802dd proc_readfd_common ((kernel.kallsyms))
        7fff812803f5 proc_readfd ((kernel.kallsyms))
        7fff8121c246 vfs_readdir ((kernel.kallsyms))
        7fff8121c665 sys_getdents ((kernel.kallsyms))
        7fff816c2715 system_call_fastpath ((kernel.kallsyms))
               bab95 __getdents64 (/usr/lib64/libc-2.17.so)

It seems that os is carrying on page reclaim. But I don’t know since there are enough free pages, why could page reclaim ocurr?


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icloud – system storage full after migrating to new iPhone, old phone has plenty of free storage

I have an iPhone 11 128GB with around 30GB of used storage.
Most of the photos are uploaded up into 200GB iCloud which is full at the moment.

I got an iPhone 12 and transferred data & settings over from iPhone 11, device to device as described here https://support.apple.com/en-us/HT210216. The transfer itself took around ~30min.

What I ended up with, is an iPhone 12 with 122GB of storage is use, photo library taking around 90GB of it. My assumption is that for whatever reason a LOT of the photos from iCloud got stored locally on iPhone 12. The phones have same amount of photos in the libraries.

My questions:

  1. how can I get rid of the photos that that are currently LOCAL on iPhone 12, while they are living in the iCloud (uploaded from iPhone 11).
  2. iPhone 11 128GB has ~90GB of free space, iCloud somehow decided it still needs to upload the photos into the cloud, filling it up completely and making my phone backups impossible. Is there a way “back” to fix this?

Thank you

memory – How to check how much “free” iGPU VRAM the system have in MB?

How to check how much free iGPU VRAM the system have?

I thought it was a simple easy task, but so far I don’t find any useful result by googling.

I knew how much VRAM I have. I knew I could run system_profiler SPDisplaysDataTyp at cml. I knew I could check GPU % of each application in Activity Monitor > % GPU Column. I knew there is Activity Monitor > Window > GPU History Window etc..

But none of them tell me how much iGPU VRAM the system uses and how much free VRAM is in MB value.

Do anyone know how to check the info?

CML way is preferred.

if not, Built-in tool is preferred.

if not, Open source tool is preferred.

if not, Free tool is prefered.

Thank you very much.

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