[PATCH 0/1] mm/page_alloc: dynamic min_free_kbytes adjustment

[wujing <realwujing@qq.com>]

Atomic allocations (GFP_ATOMIC), particularly in network interrupt contexts,
are prone to failure during bursts of traffic if the pre-configured 
min_free_kbytes (atomic reserve) is insufficient. These failures lead to 
packet drops and performance degradation.

Static tuning of vm.min_free_kbytes is often challenging: setting it too 
low risks drops, while setting it too high wastes valuable memory.

This patch series introduces a reactive mechanism that:
1. Detects critical order-0 GFP_ATOMIC allocation failures.
2. Automatically doubles vm.min_free_kbytes to reserve more memory for 
   future bursts.
3. Enforces a safety cap (1% of total RAM) to prevent OOM or excessive waste.

This allows the system to self-adjust to the workload's specific atomic 
memory requirements without manual intervention.

wujing (1):
  mm/page_alloc: auto-tune min_free_kbytes on atomic allocation failure

 mm/page_alloc.c | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

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2.39.5