THE FEUTEX TOOLKIT

Memory Page Allocation Waste

Calculate committed pages and final-page slack for a contiguous allocation.

Computer Systems workspace● Runs in your browser

01 Your input

Requested allocationbytesPage sizebytesIndependent allocations

02 Your result

View or copy raw result data

Result data

Formulapages=ceil(request/pageSize)

Sources and model references

https://www.kernel.org/doc/html/latest/admin-guide/mm/hugetlbpage.html

Worked example

Inputs

Requested allocation: 10000 bytes
Page size: 4096 bytes
Independent allocations: 100

Expected results

Pages per allocation: 3 pages
Total unused tail bytes: 228800 bytes
Total page allocation: 1228800 bytes

Load the example in the workspace to reproduce these results. Display rounding does not change the underlying calculation.

How to use this tool

Enter the labeled inputs in the indicated units.
Calculate and compare every output against the stated model assumptions.

Try this example

{
  "bytes": 10000,
  "page": 4096,
  "copies": 100
}

Accuracy and scope

Independent page-rounded allocations; actual allocators may share pages or retain additional metadata. Simplified analytical model; not a design recommendation or safety certification.

Is my data uploaded?

This tool runs locally in your browser. Input and output are not sent to a processing server. Copy or download your result before leaving the page.