evie/android_kernel_oneplus_msm8998
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block/fs: make tracking dirty task debug only

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Adding a new element "tsk_dirty" to struct page increases the size
of mem_map/vmemmap, restrict this to a debug only functionality to
save few MB of memory.

Considering a system with 1G of RAM, there will be nearly 262144
pages and thus that many number of page structures in mem_map/vmemmap.
With pointer size of 8 bytes on a 64 bit system, adding this
pointer to "struct page" means an increase of "2MB" for mem_map.

CRs-Fixed: 738692
Change-Id: Idf3217dcbe17cf1ab4d462d2aa8d39da1ffd8b13
Signed-off-by: Venkat Gopalakrishnan <venkatg@codeaurora.org>
[venkatg@codeaurora.org: Fixed trivial merge conflict]
Signed-off-by: Venkat Gopalakrishnan <venkatg@codeaurora.org>
This commit is contained in:
Venkat Gopalakrishnan 2014-10-27 18:04:22 -07:00 • committed by David Keitel
parent 014929f975
commit a627c73479
3 changed files with 38 additions and 12 deletions
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33
block/blk-core.c
View file

@ -2081,6 +2081,27 @@ out:
}
EXPORT_SYMBOL(generic_make_request);
#ifdef CONFIG_BLK_DEV_IO_TRACE
static inline struct task_struct *get_dirty_task(struct bio *bio)
{
/*
* Not all the pages in the bio are dirtied by the
* same task but most likely it will be, since the
* sectors accessed on the device must be adjacent.
*/
if (bio->bi_io_vec && bio->bi_io_vec->bv_page &&
bio->bi_io_vec->bv_page->tsk_dirty)
return bio->bi_io_vec->bv_page->tsk_dirty;
else
return current;
}
#else
static inline struct task_struct *get_dirty_task(struct bio *bio)
{
return current;
}
#endif
/**
* submit_bio - submit a bio to the block device layer for I/O
* @rw: whether to %READ or %WRITE, or maybe to %READA (read ahead)
@ -2093,7 +2114,6 @@ EXPORT_SYMBOL(generic_make_request);
*/
blk_qc_t submit_bio(int rw, struct bio *bio)
{
struct task_struct *tsk = current;
bio->bi_rw |= rw;
/*
@ -2117,16 +2137,9 @@ blk_qc_t submit_bio(int rw, struct bio *bio)
if (unlikely(block_dump)) {
char b[BDEVNAME_SIZE];
struct task_struct *tsk;
/*
* Not all the pages in the bio are dirtied by the
* same task but most likely it will be, since the
* sectors accessed on the device must be adjacent.
*/
if (bio->bi_io_vec && bio->bi_io_vec->bv_page &&
bio->bi_io_vec->bv_page->tsk_dirty)
tsk = bio->bi_io_vec->bv_page->tsk_dirty;
tsk = get_dirty_task(bio);
printk(KERN_DEBUG "%s(%d): %s block %Lu on %s (%u sectors)\n",
tsk->comm, task_pid_nr(tsk),
(rw & WRITE) ? "WRITE" : "READ",

15
fs/buffer.c
View file

@ -621,6 +621,18 @@ void mark_buffer_dirty_inode(struct buffer_head *bh, struct inode *inode)
}
EXPORT_SYMBOL(mark_buffer_dirty_inode);
#ifdef CONFIG_BLK_DEV_IO_TRACE
static inline void save_dirty_task(struct page *page)
{
/* Save the task that is dirtying this page */
page->tsk_dirty = current;
}
#else
static inline void save_dirty_task(struct page *page)
{
}
#endif
/*
* Mark the page dirty, and set it dirty in the radix tree, and mark the inode
* dirty.
@ -641,8 +653,7 @@ static void __set_page_dirty(struct page *page, struct address_space *mapping,
account_page_dirtied(page, mapping, memcg);
radix_tree_tag_set(&mapping->page_tree,
page_index(page), PAGECACHE_TAG_DIRTY);
/* Save the task that is dirtying this page */
page->tsk_dirty = current;
save_dirty_task(page);
}
spin_unlock_irqrestore(&mapping->tree_lock, flags);
}

2
include/linux/mm_types.h
View file

@ -207,7 +207,9 @@ struct page {
not kmapped, ie. highmem) */
#endif /* WANT_PAGE_VIRTUAL */
#ifdef CONFIG_BLK_DEV_IO_TRACE
struct task_struct *tsk_dirty; /* task that sets this page dirty */
#endif
#ifdef CONFIG_KMEMCHECK
/*