Why Android 15’s Switch to 16KB Memory Pages Matters for Your App

Android has historically used 4 KB memory pages. With Android 15, Google adds support for 16 KB pages and requires all new apps and updates targeting Android 15+ to be compatible by 1 Nov 2025, affecting performance, build process, and Play Store compliance.

What is a memory page?

A memory page is the smallest unit the OS uses when mapping virtual memory to physical memory, grouping many small cells into a block that the system tracks.

For decades Linux‑based systems, including Android, used a 4 KB page size as a balance between efficiency and overhead. Modern ARM64 CPUs can handle larger blocks, making 16 KB pages attractive: fewer pages mean smaller page tables, fewer TLB misses, and reduced CPU time for memory mapping.

Why is Google making this change?

Internal benchmarks show real‑world improvements: average app launch time speeds up ~3 % (up to 30 % in some cases), camera launch improves up to 6 %, system boot time drops about one second, and battery usage during launch falls ~5 %.

These gains, when multiplied across billions of devices, translate into smoother UI, lower latency, and more efficient hardware utilization.

Play Store deadline

Android 15 supports both 4 KB and 16 KB pages. Devices released from 2025 onward may choose either, but Google mandates that by 1 Nov 2025 all apps and games targeting Android 15+ must demonstrate compatibility with 16 KB pages before they can be published.

Failure to adapt will block updates from reaching the Play Store.

Who needs to care?

Pure Java/Kotlin apps are largely unaffected because the runtime handles memory management. The burden falls on native‑code projects: NDK‑based apps, high‑performance libraries, game engines like Unity or Unreal, and SDKs for voice, video, or machine‑learning that may assume a 4 KB page size.

Hard‑coded constants such as PAGE_SIZE = 4096 or binaries aligned to 4 KB will not run correctly on 16 KB devices.

What must developers do?

Modern NDK versions (r28+) already default to the correct alignment. Older toolchains may need explicit linker flags, e.g., -Wl,-z,max-page-size=16384 or common-page-size=16384.

Replace hard‑coded page size constants with runtime queries, e.g., sysconf(_SC_PAGESIZE) in C, or Os.sysconf(OsConstants._SC_PAGE_SIZE) in Java.

Test using the Android Studio emulator image configured for 16 KB pages or on supported devices with adb shell getconf PAGE_SIZE. Samsung’s remote test lab also provides compliant environments.

Audit third‑party SDKs; ensure they have been updated for 16 KB support (e.g., Unity’s Vivox SDK is compliant).

The bigger picture

While the transition requires rebuilding, testing, and dependency review, it aligns Android with modern ARM64 capabilities and reduces friction for memory‑intensive workloads.

It also encourages developers to write code that queries page size at runtime, future‑proofing apps for possible larger page sizes such as 64 KB.

Conclusion

The move to 16 KB pages is a platform‑wide performance upgrade and a compliance deadline. Users will see faster launches, quicker camera response, and longer battery life, while developers must adapt now to avoid being blocked from the Play Store.