page-writeback.c (f6ef943813ac3085ece7252ea101d663581219f6) page-writeback.c (ed5b43f15a8e86e3ae939b98bc161ee973ecedf2)
1/*
2 * mm/page-writeback.c.
3 *
4 * Copyright (C) 2002, Linus Torvalds.
5 *
6 * Contains functions related to writing back dirty pages at the
7 * address_space level.
8 *

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83int dirty_expire_interval = 30 * HZ;
84
85/*
86 * Flag that makes the machine dump writes/reads and block dirtyings.
87 */
88int block_dump;
89
90/*
1/*
2 * mm/page-writeback.c.
3 *
4 * Copyright (C) 2002, Linus Torvalds.
5 *
6 * Contains functions related to writing back dirty pages at the
7 * address_space level.
8 *

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83int dirty_expire_interval = 30 * HZ;
84
85/*
86 * Flag that makes the machine dump writes/reads and block dirtyings.
87 */
88int block_dump;
89
90/*
91 * Flag that puts the machine in "laptop mode".
91 * Flag that puts the machine in "laptop mode". Doubles as a timeout in jiffies:
92 * a full sync is triggered after this time elapses without any disk activity.
92 */
93int laptop_mode;
94
95EXPORT_SYMBOL(laptop_mode);
96
97/* End of sysctl-exported parameters */
98
99

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463
464/*
465 * We've spun up the disk and we're in laptop mode: schedule writeback
466 * of all dirty data a few seconds from now. If the flush is already scheduled
467 * then push it back - the user is still using the disk.
468 */
469void laptop_io_completion(void)
470{
93 */
94int laptop_mode;
95
96EXPORT_SYMBOL(laptop_mode);
97
98/* End of sysctl-exported parameters */
99
100

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464
465/*
466 * We've spun up the disk and we're in laptop mode: schedule writeback
467 * of all dirty data a few seconds from now. If the flush is already scheduled
468 * then push it back - the user is still using the disk.
469 */
470void laptop_io_completion(void)
471{
471 mod_timer(&laptop_mode_wb_timer, jiffies + laptop_mode * HZ);
472 mod_timer(&laptop_mode_wb_timer, jiffies + laptop_mode);
472}
473
474/*
475 * We're in laptop mode and we've just synced. The sync's writes will have
476 * caused another writeback to be scheduled by laptop_io_completion.
477 * Nothing needs to be written back anymore, so we unschedule the writeback.
478 */
479void laptop_sync_completion(void)

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474
475/*
476 * We're in laptop mode and we've just synced. The sync's writes will have
477 * caused another writeback to be scheduled by laptop_io_completion.
478 * Nothing needs to be written back anymore, so we unschedule the writeback.
479 */
480void laptop_sync_completion(void)

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