From 7c1d4f879c02063610487f445327b3358fde191a Mon Sep 17 00:00:00 2001 From: Johannes Weiner Date: Thu, 8 Dec 2011 15:41:49 +1100 Subject: [PATCH] mm: writeback: cleanups in preparation for per-zone dirty limits The next patch will introduce per-zone dirty limiting functions in addition to the traditional global dirty limiting. Rename determine_dirtyable_memory() to global_dirtyable_memory() before adding the zone-specific version, and fix up its documentation. Also, move the functions to determine the dirtyable memory and the function to calculate the dirty limit based on that together so that their relationship is more apparent and that they can be commented on as a group. Signed-off-by: Johannes Weiner Reviewed-by: Minchan Kim Acked-by: Mel Gorman Reviewed-by: Michal Hocko Cc: KAMEZAWA Hiroyuki Cc: Christoph Hellwig Cc: Wu Fengguang Cc: Dave Chinner Cc: Jan Kara Cc: Shaohua Li Cc: Rik van Riel Cc: Chris Mason Signed-off-by: Andrew Morton --- mm/page-writeback.c | 93 +++++++++++++++++++++++---------------------- 1 file changed, 47 insertions(+), 46 deletions(-) diff --git a/mm/page-writeback.c b/mm/page-writeback.c index 189263f40b06..6143c59eac52 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -146,6 +146,7 @@ static struct prop_descriptor vm_completions; * We make sure that the background writeout level is below the adjusted * clamping level. */ + static unsigned long highmem_dirtyable_memory(unsigned long total) { #ifdef CONFIG_HIGHMEM @@ -172,12 +173,12 @@ static unsigned long highmem_dirtyable_memory(unsigned long total) } /** - * determine_dirtyable_memory - amount of memory that may be used + * global_dirtyable_memory - number of globally dirtyable pages * - * Returns the numebr of pages that can currently be freed and used - * by the kernel for direct mappings. + * Returns the global number of pages potentially available for dirty + * page cache. This is the base value for the global dirty limits. */ -static unsigned long determine_dirtyable_memory(void) +unsigned long global_dirtyable_memory(void) { unsigned long x; @@ -190,6 +191,47 @@ static unsigned long determine_dirtyable_memory(void) return x + 1; /* Ensure that we never return 0 */ } +/* + * global_dirty_limits - background-writeback and dirty-throttling thresholds + * + * Calculate the dirty thresholds based on sysctl parameters + * - vm.dirty_background_ratio or vm.dirty_background_bytes + * - vm.dirty_ratio or vm.dirty_bytes + * The dirty limits will be lifted by 1/4 for PF_LESS_THROTTLE (ie. nfsd) and + * real-time tasks. + */ +void global_dirty_limits(unsigned long *pbackground, unsigned long *pdirty) +{ + unsigned long background; + unsigned long dirty; + unsigned long uninitialized_var(available_memory); + struct task_struct *tsk; + + if (!vm_dirty_bytes || !dirty_background_bytes) + available_memory = global_dirtyable_memory(); + + if (vm_dirty_bytes) + dirty = DIV_ROUND_UP(vm_dirty_bytes, PAGE_SIZE); + else + dirty = (vm_dirty_ratio * available_memory) / 100; + + if (dirty_background_bytes) + background = DIV_ROUND_UP(dirty_background_bytes, PAGE_SIZE); + else + background = (dirty_background_ratio * available_memory) / 100; + + if (background >= dirty) + background = dirty / 2; + tsk = current; + if (tsk->flags & PF_LESS_THROTTLE || rt_task(tsk)) { + background += background / 4; + dirty += dirty / 4; + } + *pbackground = background; + *pdirty = dirty; + trace_global_dirty_state(background, dirty); +} + /* * couple the period to the dirty_ratio: * @@ -202,7 +244,7 @@ static int calc_period_shift(void) if (vm_dirty_bytes) dirty_total = vm_dirty_bytes / PAGE_SIZE; else - dirty_total = (vm_dirty_ratio * determine_dirtyable_memory()) / + dirty_total = (vm_dirty_ratio * global_dirtyable_memory()) / 100; return 2 + ilog2(dirty_total - 1); } @@ -362,47 +404,6 @@ static unsigned long hard_dirty_limit(unsigned long thresh) return max(thresh, global_dirty_limit); } -/* - * global_dirty_limits - background-writeback and dirty-throttling thresholds - * - * Calculate the dirty thresholds based on sysctl parameters - * - vm.dirty_background_ratio or vm.dirty_background_bytes - * - vm.dirty_ratio or vm.dirty_bytes - * The dirty limits will be lifted by 1/4 for PF_LESS_THROTTLE (ie. nfsd) and - * real-time tasks. - */ -void global_dirty_limits(unsigned long *pbackground, unsigned long *pdirty) -{ - unsigned long background; - unsigned long dirty; - unsigned long uninitialized_var(available_memory); - struct task_struct *tsk; - - if (!vm_dirty_bytes || !dirty_background_bytes) - available_memory = determine_dirtyable_memory(); - - if (vm_dirty_bytes) - dirty = DIV_ROUND_UP(vm_dirty_bytes, PAGE_SIZE); - else - dirty = (vm_dirty_ratio * available_memory) / 100; - - if (dirty_background_bytes) - background = DIV_ROUND_UP(dirty_background_bytes, PAGE_SIZE); - else - background = (dirty_background_ratio * available_memory) / 100; - - if (background >= dirty) - background = dirty / 2; - tsk = current; - if (tsk->flags & PF_LESS_THROTTLE || rt_task(tsk)) { - background += background / 4; - dirty += dirty / 4; - } - *pbackground = background; - *pdirty = dirty; - trace_global_dirty_state(background, dirty); -} - /** * bdi_dirty_limit - @bdi's share of dirty throttling threshold * @bdi: the backing_dev_info to query -- 2.39.5