Function report |
Source Code:mm\swapfile.c |
Create Date:2022-07-28 15:16:24 |
Last Modify:2020-03-17 22:19:49 | Copyright©Brick |
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Name:swap allocation tell device that a cluster of swap can now be discarded,* to allow the swap device to optimize its wear-levelling.
Proto:static void discard_swap_cluster(struct swap_info_struct *si, unsigned long start_page, unsigned long nr_pages)
Type:void
Parameter:
Type | Parameter | Name |
---|---|---|
struct swap_info_struct * | si | |
unsigned long | start_page | |
unsigned long | nr_pages |
231 | se = offset_to_swap_extent(si, start_page) |
234 | offset = start_page - start_page |
235 | start_block = start_block + offset |
240 | start_page += nr_blocks |
243 | start_block <<= PAGE_SHIFT determines the page size - 9 |
244 | nr_blocks <<= PAGE_SHIFT determines the page size - 9 |
245 | If blkdev_issue_discard(swap device or bdev of swap file , start_block, nr_blocks, GFP_NOIO, 0) Then Break |
Name | Describe |
---|---|
swap_do_scheduled_discard | Doing discard actually. After a cluster discard is finished, the cluster* will be added to free cluster list. caller should hold si->lock. |
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