try_to_free_pages

Name:try_to_free_pages

Proto:unsigned long try_to_free_pages(struct zonelist *zonelist, int order, gfp_t gfp_mask, nodemask_t *nodemask)

Type:unsigned long

Parameter:

Type	Parameter	Name
struct zonelist *	zonelist
int	order
gfp_t	gfp_mask
nodemask_t *	nodemask

3260

struct scan_control sc = { How many pages shrink_list() should reclaim = SWAP_CLUSTER_MAX, This context's GFP mask = Applies per-task gfp context to the given allocation flags.* PF_MEMALLOC_NOIO implies GFP_NOIO* PF_MEMALLOC_NOFS implies GFP_NOFS* PF_MEMALLOC_NOCMA implies no allocation from CMA region., The highest zone to isolate pages for reclaim from = gfp_zone(gfp_mask), Allocation order = order, * Nodemask of nodes allowed by the caller. If NULL, all nodes * are scanned. = nodemask, Scan (total_size >> priority) pages at once = The "priority" of VM scanning is how much of the queues we will scan in one* go. A value of 12 for DEF_PRIORITY implies that we will scan 1/4096th of the* queues ("queue_length >> 12") during an aging round., Writepage batching in laptop mode; RECLAIM_WRITE = !Flag that puts the machine in "laptop mode". Doubles as a timeout in jiffies:* a full sync is triggered after this time elapses without any disk activity., Can mapped pages be reclaimed? = 1, Can pages be swapped as part of reclaim? = 1, }

3276

BUILD_BUG_ON - break compile if a condition is true(Free memory management - zoned buddy allocator. > S8_MAX)

3277

BUILD_BUG_ON - break compile if a condition is true(The "priority" of VM scanning is how much of the queues we will scan in one* go. A value of 12 for DEF_PRIORITY implies that we will scan 1/4096th of the* queues ("queue_length >> 12") during an aging round. > S8_MAX)

3278

BUILD_BUG_ON - break compile if a condition is true(MAX_NR_ZONES > S8_MAX)

3285

If Throttle direct reclaimers if backing storage is backed by the network* and the PFMEMALLOC reserve for the preferred node is getting dangerously* depleted. kswapd will continue to make progress and wake the processes* when the low watermark is reached. Then Return 1

3288

set_task_reclaim_state(current process, & for recording the reclaimed slab by now )

3289

trace_mm_vmscan_direct_reclaim_begin(order, This context's GFP mask )

3291

nr_reclaimed = This is the main entry point to direct page reclaim

3293

trace_mm_vmscan_direct_reclaim_end(nr_reclaimed)

3294

set_task_reclaim_state(current process, NULL)

3296

Return nr_reclaimed

**Caller**
Name	Describe
__perform_reclaim	Perform direct synchronous page reclaim

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