SET_DMA_RESERVE(9) Memory Management in Linux SET_DMA_RESERVE(9)
NAME
set_dma_reserve - set the specified number of pages reserved in the first zone
SYNOPSIS
void set_dma_reserve(unsigned long new_dma_reserve);
ARGUMENTS
new_dma_reserve
The number of pages to mark reserved
DESCRIPTION
The per-cpu batchsize and zone watermarks are determined by present_pages. In the DMA zone, a significant percentage may be consumed by
kernel image and other unfreeable allocations which can skew the watermarks badly. This function may optionally be used to account for
unfreeable pages in the first zone (e.g., ZONE_DMA). The effect will be lower watermarks and smaller per-cpu batchsize.
COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 SET_DMA_RESERVE(9)
