set_recommended_min_free_kbytes

Name:set_recommended_min_free_kbytes

Proto:static void set_recommended_min_free_kbytes(void)

Type:void

Parameter:Nothing

2144

nr_zones = 0

2147

do nothing (zone)

2152

If zone_idx() returns 0 for the ZONE_DMA zone, 1 for the ZONE_NORMAL zone, etc.(zone) > gfp_zone(GFP_USER) Then Continue

2155

2159

recommended_min = pageblock_nr_pages * nr_zones * 2

2167

recommended_min += pageblock_nr_pages * nr_zones * MIGRATE_PCPTYPES * MIGRATE_PCPTYPES

2171

recommended_min = min - return minimum of two values of the same or compatible types*@x: first value*@y: second value(recommended_min, (unsignedlong)r_free_buffer_pages - count number of pages beyond high watermark* nr_free_buffer_pages() counts the number of pages which are beyond the high* watermark within ZONE_DMA and ZONE_NORMAL.* Return: number of pages beyond high watermark within ZONE_DMA and / 20)

2173

recommended_min <<= PAGE_SHIFT determines the page size - 10

2175

If recommended_min > min_free_kbytes Then

2176

If user_min_free_kbytes >= 0 Then pr_info("raising min_free_kbytes from %d to %lu to help transparent hugepage allocations\n", min_free_kbytes, recommended_min)

2180

min_free_kbytes = recommended_min

2182

setup_per_zone_wmarks - called when min_free_kbytes changes* or when memory is hot-{added|removed}* Ensures that the watermark[min,low,high] values for each zone are set* correctly with respect to min_free_kbytes.

**Caller**
Name	Describe
start_stop_khugepaged

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