CODEWITHSUNDEEP
linuxmemory-managementprocesslinux-kernellinux-device-driver
feeling_lonely
feeling_lonely

Reputation: 6853

How can I find the pages that belong to the heap in a linux process?

I would like to write a simple kernel function that iterates over all the vm_area_structs that belong to a specific process and mark each one of them as belonging to the heap or not. Assume that I can add a boolean field in the vm_area_struct that will be set for heap pages and reset for other pages.

I have looked into the mm_struct, vm_area_struct, and task_struct... but found nothing that can help.

Update: I am guessing start_brk and brk have something to do with this?

Upvotes: 0

Views: 322

Answers (1)

kaiwan
kaiwan

Reputation: 2144

(Am inserting my last comment as an answer, as the formatting within "Comment" is not that great):

Wrt my prev comment: the relevant code (to look up VMAs of a given PID) seems to be here: fs/proc/task_mmu.c .

And, yes indeed, the "[heap]" is marked by this code snippet from the above src file (kernel ver 3.10.24):

*fs/proc/task_mmu.c:show_map_vma()* ... if (vma->vm_start <= mm->brk && vma->vm_end >= mm->start_brk) { name = "[heap]"; goto done; } ...

Upvotes: 1

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