In a computer with two CPUs, how can I get the physical address of local memory of each CPU?

Question

My computer has the following specifications

• 2 Intel CPU x86_64
• Total 8GB memory (4GB per CPU)
• O/S is Rocky Linux 9

I want to reserve 1GB of memory per CPU using the memmap parameter in grub. I checked dmesg and /proc/meminfo and even used numaclt -H. But I couldn't find the physical address of the memory for each CPU.

How can I get physical addresses of local memory of each CPU?

Answer 1

If your intention is to run an application on a specific CPU core, allocate specific set of resources (memory) to it, you can do something like:

Taskset

#launch google-chrome on CPU core 0
taskset 0x1 google-chrome

Cgroups

# Create a cgroup
mkdir /sys/fs/cgroup/memory/my_cgroup

# Add the process to it
echo $PID > /sys/fs/cgroup/memory/my_cgroup/cgroup.procs

# Set the limit to 100MB
echo $((100 * 1024 * 1024)) > /sys/fs/cgroup/memory/my_cgroup/memory.limit_in_bytes

It's always a good idea to interact with hardware via OS abstractions, unless we know exactly what we're doing/undoing.