Function report |
Source Code:mm\page_idle.c |
Create Date:2022-07-28 16:34:31 |
Last Modify:2020-03-12 14:18:49 | Copyright©Brick |
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Name:page_idle_bitmap_read
Proto:static ssize_t page_idle_bitmap_read(struct file *file, struct kobject *kobj, struct bin_attribute *attr, char *buf, loff_t pos, size_t count)
Type:ssize_t
Parameter:
Type | Parameter | Name |
---|---|---|
struct file * | file | |
struct kobject * | kobj | |
struct bin_attribute * | attr | |
char * | buf | |
loff_t | pos | |
size_t | count |
130 | If pos % BITMAP_CHUNK_SIZE || count % BITMAP_CHUNK_SIZE Then Return -EINVAL |
133 | pfn = pos * BITS_PER_BYTE |
137 | end_pfn = pfn + count * BITS_PER_BYTE |
142 | bit = pfn % BITMAP_CHUNK_BITS |
145 | page = Idle page tracking only considers user memory pages, for other types of* pages the idle flag is always unset and an attempt to set it is silently* ignored |
146 | If page Then |
147 | If page_is_idle(page) Then |
154 | If page_is_idle(page) Then out |= 1ULL << bit |
159 | If bit == BITMAP_CHUNK_BITS - 1 Then out++ |
161 | cond_resched() |
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