All Questions
628 questions
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Finding actual memory usage of process
I have seen similar questions 1, 2, and understand the difference between RSS/VSZ.
I've some uses of mmap'ing distinct virtual memory regions to the same underlying physical memory.
In this case, /...
- 101
1
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0
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51
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Weird behavior: Does libasan consume system memory constantly in Linux?
I am working on an embedded Linux system (kernel-5.10), and the cross GCC only supports -fsanitize=address for address sanitizer.
Then I built a testing program with -fsanitize=address and -lasan. ...
- 591
-1
votes
1
answer
84
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Resizing filesystem to increase space in AWS EC2 instance
I created an AWS EC2 instance, and I am using the EC2 instance to maintain a database. I'm currently trying to perform some post-processing on my database (by quering my database in batches), but this ...
- 107
1
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0
answers
16
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Kernel Oops happened in hci_send_acl() in Linux
I am working on an embedded Linux system (kernel-5.10.150), there is an bluetooth+WIFI module in system.
By wifi+BT testing, I found there is a kernel oops as follows,
[ 101.717826] CPU 0 Unable to ...
- 591
1
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0
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30
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Understanding Unexpected Page Faults in a Memory Touch Program on Linux
I wrote a small C program to allocate a large memory region, touch one byte in each 4 KiB page, and print statistics about page faults. The goal is to understand how Linux handles memory allocation ...
- 13
0
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2
answers
213
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How to use vm.overcommit_memory=1 without getting system hung?
I am using vm.overcommit_memory=1 on my linux system which has been helpful to allow starting multiple applications which otherwise wouldn't even start with default value of 0, however, sometimes my ...
- 3
7
votes
2
answers
980
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Understanding Linux 'top' command: Memory vs Swap display format confusion
Does the "avail Mem" value actually relate to physical memory rather than swap, despite being displayed on the swap line? I noticed there's a period at the end of the "swap used" ...
- 2,010
1
vote
1
answer
162
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Is RAM-backed VRAM from an iGPU counted in regular linux memory statistics?
Integrated GPUs (iGPUs) use the system RAM to store GPU VRAM. How to know VRAM usage of iGPU? explains usage of GPU-specific tools to monitor the amount of VRAM, but I'm interested in whether the ...
- 341
1
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0
answers
41
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Radix Tree vs Multi-level bitmap
The Linux kernel (at least before using XArrays as far as I'm aware, which to my knowledge are wrappers around Radix Trees anyway) uses radix trees in its address_space structs which every file has. ...
- 11
3
votes
2
answers
129
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How to find who is using the memory
I am trying to find out what is using my memory, when running free -m I get info that only 1GB is free as aswell as available. However, running the top shows process only using 0.7% memory so I am not ...
- 151
-1
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1
answer
138
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How to get the physical address of a file in RAM? [closed]
I have found a couple of related posts:
How to see information inside inode data structure
Is it possible to find the physical address of a file in disk?
But nothing quite answers my question. I have ...
- 169
0
votes
0
answers
44
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Discrepancy between vm.nr_hugepages and HugePages_Total
My /etc/sysctl.conf have: vm.nr_hugepages = 20484
but (even after sysctl -p) I got:
[root@vm04-oracle-19c ~]# cat /proc/meminfo | grep -i hugepages
AnonHugePages: 0 kB
ShmemHugePages: 0 ...
- 499
1
vote
0
answers
148
views
How to dump user space stacks in Linux kernel on memory fault?
I am working on an embedded Linux system (kernel-5.10.24), the CPU is 32bit MIPs.
The applications run in the system may trigger invalid memory access, which will be shot by a SIGSEGV from kernel, and ...
- 591
0
votes
1
answer
600
views
How to know VRAM usage of iGPU?
How can you know the memory used as vram by an iGPU (aka integrated GPU, integrated graphics)?
- 321
0
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0
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45
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Puzzlement on memory statistics in Linux
I am working on an embedded Linux system (Kernel-5.10.186) on a SOC platform.
Now I am doing long-time testing to collect memory statistics in the system.
And I had a shell script to collect memory ...
- 591