195cf453d2
Add vm.highmem_is_dirtyable toggle A 32 bit machine with HIGHMEM64 enabled running DCC has an MMAPed file of approximately 2Gb size which contains a hash format that is written randomly by the dbclean process. On 2.6.16 this process took a few minutes. With lowmem only accounting of dirty ratios, this takes about 12 hours of 100% disk IO, all random writes. Include a toggle in /proc/sys/vm/highmem_is_dirtyable which can be set to 1 to add the highmem back to the total available memory count. [akpm@linux-foundation.org: Fix the CONFIG_DETECT_SOFTLOCKUP=y build] Signed-off-by: Bron Gondwana <brong@fastmail.fm> Cc: Ethan Solomita <solo@google.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: WU Fengguang <wfg@mail.ustc.edu.cn> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
149 lines
4.4 KiB
C
149 lines
4.4 KiB
C
/*
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* include/linux/writeback.h
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*/
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#ifndef WRITEBACK_H
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#define WRITEBACK_H
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#include <linux/sched.h>
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#include <linux/fs.h>
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struct backing_dev_info;
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extern spinlock_t inode_lock;
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extern struct list_head inode_in_use;
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extern struct list_head inode_unused;
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/*
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* Yes, writeback.h requires sched.h
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* No, sched.h is not included from here.
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*/
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static inline int task_is_pdflush(struct task_struct *task)
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{
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return task->flags & PF_FLUSHER;
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}
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#define current_is_pdflush() task_is_pdflush(current)
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/*
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* fs/fs-writeback.c
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*/
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enum writeback_sync_modes {
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WB_SYNC_NONE, /* Don't wait on anything */
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WB_SYNC_ALL, /* Wait on every mapping */
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WB_SYNC_HOLD, /* Hold the inode on sb_dirty for sys_sync() */
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};
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/*
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* A control structure which tells the writeback code what to do. These are
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* always on the stack, and hence need no locking. They are always initialised
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* in a manner such that unspecified fields are set to zero.
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*/
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struct writeback_control {
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struct backing_dev_info *bdi; /* If !NULL, only write back this
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queue */
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enum writeback_sync_modes sync_mode;
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unsigned long *older_than_this; /* If !NULL, only write back inodes
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older than this */
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long nr_to_write; /* Write this many pages, and decrement
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this for each page written */
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long pages_skipped; /* Pages which were not written */
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/*
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* For a_ops->writepages(): is start or end are non-zero then this is
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* a hint that the filesystem need only write out the pages inside that
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* byterange. The byte at `end' is included in the writeout request.
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*/
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loff_t range_start;
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loff_t range_end;
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unsigned nonblocking:1; /* Don't get stuck on request queues */
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unsigned encountered_congestion:1; /* An output: a queue is full */
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unsigned for_kupdate:1; /* A kupdate writeback */
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unsigned for_reclaim:1; /* Invoked from the page allocator */
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unsigned for_writepages:1; /* This is a writepages() call */
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unsigned range_cyclic:1; /* range_start is cyclic */
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};
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/*
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* fs/fs-writeback.c
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*/
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void writeback_inodes(struct writeback_control *wbc);
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int inode_wait(void *);
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void sync_inodes_sb(struct super_block *, int wait);
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void sync_inodes(int wait);
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/* writeback.h requires fs.h; it, too, is not included from here. */
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static inline void wait_on_inode(struct inode *inode)
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{
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might_sleep();
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wait_on_bit(&inode->i_state, __I_LOCK, inode_wait,
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TASK_UNINTERRUPTIBLE);
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}
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static inline void inode_sync_wait(struct inode *inode)
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{
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might_sleep();
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wait_on_bit(&inode->i_state, __I_SYNC, inode_wait,
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TASK_UNINTERRUPTIBLE);
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}
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/*
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* mm/page-writeback.c
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*/
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int wakeup_pdflush(long nr_pages);
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void laptop_io_completion(void);
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void laptop_sync_completion(void);
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void throttle_vm_writeout(gfp_t gfp_mask);
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/* These are exported to sysctl. */
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extern int dirty_background_ratio;
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extern int vm_dirty_ratio;
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extern int dirty_writeback_interval;
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extern int dirty_expire_interval;
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extern int vm_highmem_is_dirtyable;
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extern int block_dump;
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extern int laptop_mode;
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extern int dirty_ratio_handler(struct ctl_table *table, int write,
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struct file *filp, void __user *buffer, size_t *lenp,
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loff_t *ppos);
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struct ctl_table;
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struct file;
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int dirty_writeback_centisecs_handler(struct ctl_table *, int, struct file *,
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void __user *, size_t *, loff_t *);
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void page_writeback_init(void);
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void balance_dirty_pages_ratelimited_nr(struct address_space *mapping,
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unsigned long nr_pages_dirtied);
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static inline void
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balance_dirty_pages_ratelimited(struct address_space *mapping)
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{
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balance_dirty_pages_ratelimited_nr(mapping, 1);
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}
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typedef int (*writepage_t)(struct page *page, struct writeback_control *wbc,
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void *data);
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int pdflush_operation(void (*fn)(unsigned long), unsigned long arg0);
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int generic_writepages(struct address_space *mapping,
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struct writeback_control *wbc);
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int write_cache_pages(struct address_space *mapping,
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struct writeback_control *wbc, writepage_t writepage,
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void *data);
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int do_writepages(struct address_space *mapping, struct writeback_control *wbc);
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int sync_page_range(struct inode *inode, struct address_space *mapping,
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loff_t pos, loff_t count);
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int sync_page_range_nolock(struct inode *inode, struct address_space *mapping,
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loff_t pos, loff_t count);
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void set_page_dirty_balance(struct page *page, int page_mkwrite);
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void writeback_set_ratelimit(void);
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/* pdflush.c */
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extern int nr_pdflush_threads; /* Global so it can be exported to sysctl
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read-only. */
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#endif /* WRITEBACK_H */
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