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Subject[RFC 3/8] Add a nodemask to pdflush functions
pdflush: Allow the passing of a nodemask parameter

If we want to support nodeset specific writeout then we need a way
to communicate the set of nodes that an operation should affect.

So add a nodemask_t parameter to the pdflush functions and also
store the nodemask in the pdflush control structure.

Signed-off-by: Christoph Lameter <clameter@sgi.com>

Index: linux-2.6.20-rc5/include/linux/writeback.h
===================================================================
--- linux-2.6.20-rc5.orig/include/linux/writeback.h 2007-01-15 21:34:38.564104333 -0600
+++ linux-2.6.20-rc5/include/linux/writeback.h 2007-01-15 21:34:43.135798088 -0600
@@ -81,7 +81,7 @@ static inline void wait_on_inode(struct
/*
* mm/page-writeback.c
*/
-int wakeup_pdflush(long nr_pages);
+int wakeup_pdflush(long nr_pages, nodemask_t *nodes);
void laptop_io_completion(void);
void laptop_sync_completion(void);
void throttle_vm_writeout(void);
@@ -109,7 +109,8 @@ balance_dirty_pages_ratelimited(struct a
balance_dirty_pages_ratelimited_nr(mapping, 1);
}

-int pdflush_operation(void (*fn)(unsigned long), unsigned long arg0);
+int pdflush_operation(void (*fn)(unsigned long, nodemask_t *nodes),
+ unsigned long arg0, nodemask_t *nodes);
extern int generic_writepages(struct address_space *mapping,
struct writeback_control *wbc);
int do_writepages(struct address_space *mapping, struct writeback_control *wbc);
Index: linux-2.6.20-rc5/mm/page-writeback.c
===================================================================
--- linux-2.6.20-rc5.orig/mm/page-writeback.c 2007-01-15 21:34:38.573870823 -0600
+++ linux-2.6.20-rc5/mm/page-writeback.c 2007-01-15 21:34:43.150447823 -0600
@@ -101,7 +101,7 @@ EXPORT_SYMBOL(laptop_mode);
/* End of sysctl-exported parameters */


-static void background_writeout(unsigned long _min_pages);
+static void background_writeout(unsigned long _min_pages, nodemask_t *nodes);

/*
* Work out the current dirty-memory clamping and background writeout
@@ -244,7 +244,7 @@ static void balance_dirty_pages(struct a
*/
if ((laptop_mode && pages_written) ||
(!laptop_mode && (nr_reclaimable > background_thresh)))
- pdflush_operation(background_writeout, 0);
+ pdflush_operation(background_writeout, 0, NULL);
}

void set_page_dirty_balance(struct page *page)
@@ -325,7 +325,7 @@ void throttle_vm_writeout(void)
* writeback at least _min_pages, and keep writing until the amount of dirty
* memory is less than the background threshold, or until we're all clean.
*/
-static void background_writeout(unsigned long _min_pages)
+static void background_writeout(unsigned long _min_pages, nodemask_t *unused)
{
long min_pages = _min_pages;
struct writeback_control wbc = {
@@ -365,12 +365,12 @@ static void background_writeout(unsigned
* the whole world. Returns 0 if a pdflush thread was dispatched. Returns
* -1 if all pdflush threads were busy.
*/
-int wakeup_pdflush(long nr_pages)
+int wakeup_pdflush(long nr_pages, nodemask_t *nodes)
{
if (nr_pages == 0)
nr_pages = global_page_state(NR_FILE_DIRTY) +
global_page_state(NR_UNSTABLE_NFS);
- return pdflush_operation(background_writeout, nr_pages);
+ return pdflush_operation(background_writeout, nr_pages, nodes);
}

static void wb_timer_fn(unsigned long unused);
@@ -394,7 +394,7 @@ static DEFINE_TIMER(laptop_mode_wb_timer
* older_than_this takes precedence over nr_to_write. So we'll only write back
* all dirty pages if they are all attached to "old" mappings.
*/
-static void wb_kupdate(unsigned long arg)
+static void wb_kupdate(unsigned long arg, nodemask_t *unused)
{
unsigned long oldest_jif;
unsigned long start_jif;
@@ -454,18 +454,18 @@ int dirty_writeback_centisecs_handler(ct

static void wb_timer_fn(unsigned long unused)
{
- if (pdflush_operation(wb_kupdate, 0) < 0)
+ if (pdflush_operation(wb_kupdate, 0, NULL) < 0)
mod_timer(&wb_timer, jiffies + HZ); /* delay 1 second */
}

-static void laptop_flush(unsigned long unused)
+static void laptop_flush(unsigned long unused, nodemask_t *unused2)
{
sys_sync();
}

static void laptop_timer_fn(unsigned long unused)
{
- pdflush_operation(laptop_flush, 0);
+ pdflush_operation(laptop_flush, 0, NULL);
}

/*
Index: linux-2.6.20-rc5/mm/pdflush.c
===================================================================
--- linux-2.6.20-rc5.orig/mm/pdflush.c 2007-01-15 21:34:38.582660664 -0600
+++ linux-2.6.20-rc5/mm/pdflush.c 2007-01-15 21:34:43.161190961 -0600
@@ -83,10 +83,12 @@ static unsigned long last_empty_jifs;
*/
struct pdflush_work {
struct task_struct *who; /* The thread */
- void (*fn)(unsigned long); /* A callback function */
+ void (*fn)(unsigned long, nodemask_t *); /* A callback function */
unsigned long arg0; /* An argument to the callback */
struct list_head list; /* On pdflush_list, when idle */
unsigned long when_i_went_to_sleep;
+ int have_nodes; /* Nodes were specified */
+ nodemask_t nodes; /* Nodes of interest */
};

static int __pdflush(struct pdflush_work *my_work)
@@ -123,7 +125,8 @@ static int __pdflush(struct pdflush_work
}
spin_unlock_irq(&pdflush_lock);

- (*my_work->fn)(my_work->arg0);
+ (*my_work->fn)(my_work->arg0,
+ my_work->have_nodes ? &my_work->nodes : NULL);

/*
* Thread creation: For how long have there been zero
@@ -197,7 +200,8 @@ static int pdflush(void *dummy)
* Returns zero if it indeed managed to find a worker thread, and passed your
* payload to it.
*/
-int pdflush_operation(void (*fn)(unsigned long), unsigned long arg0)
+int pdflush_operation(void (*fn)(unsigned long, nodemask_t *),
+ unsigned long arg0, nodemask_t *nodes)
{
unsigned long flags;
int ret = 0;
@@ -217,6 +221,11 @@ int pdflush_operation(void (*fn)(unsigne
last_empty_jifs = jiffies;
pdf->fn = fn;
pdf->arg0 = arg0;
+ if (nodes) {
+ pdf->nodes = *nodes;
+ pdf->have_nodes = 1;
+ } else
+ pdf->have_nodes = 0;
wake_up_process(pdf->who);
spin_unlock_irqrestore(&pdflush_lock, flags);
}
Index: linux-2.6.20-rc5/mm/vmscan.c
===================================================================
--- linux-2.6.20-rc5.orig/mm/vmscan.c 2007-01-15 21:34:38.592427153 -0600
+++ linux-2.6.20-rc5/mm/vmscan.c 2007-01-15 21:34:43.173887398 -0600
@@ -1065,7 +1065,7 @@ unsigned long try_to_free_pages(struct z
*/
if (total_scanned > sc.swap_cluster_max +
sc.swap_cluster_max / 2) {
- wakeup_pdflush(laptop_mode ? 0 : total_scanned);
+ wakeup_pdflush(laptop_mode ? 0 : total_scanned, NULL);
sc.may_writepage = 1;
}

Index: linux-2.6.20-rc5/fs/buffer.c
===================================================================
--- linux-2.6.20-rc5.orig/fs/buffer.c 2007-01-15 21:34:38.601216994 -0600
+++ linux-2.6.20-rc5/fs/buffer.c 2007-01-15 21:34:43.195373675 -0600
@@ -357,7 +357,7 @@ static void free_more_memory(void)
struct zone **zones;
pg_data_t *pgdat;

- wakeup_pdflush(1024);
+ wakeup_pdflush(1024, NULL);
yield();

for_each_online_pgdat(pgdat) {
Index: linux-2.6.20-rc5/fs/super.c
===================================================================
--- linux-2.6.20-rc5.orig/fs/super.c 2007-01-15 21:34:38.610983483 -0600
+++ linux-2.6.20-rc5/fs/super.c 2007-01-15 21:34:43.208070111 -0600
@@ -618,7 +618,7 @@ int do_remount_sb(struct super_block *sb
return 0;
}

-static void do_emergency_remount(unsigned long foo)
+static void do_emergency_remount(unsigned long foo, nodemask_t *bar)
{
struct super_block *sb;

@@ -646,7 +646,7 @@ static void do_emergency_remount(unsigne

void emergency_remount(void)
{
- pdflush_operation(do_emergency_remount, 0);
+ pdflush_operation(do_emergency_remount, 0, NULL);
}

/*
Index: linux-2.6.20-rc5/fs/sync.c
===================================================================
--- linux-2.6.20-rc5.orig/fs/sync.c 2007-01-15 21:34:38.622703271 -0600
+++ linux-2.6.20-rc5/fs/sync.c 2007-01-15 21:34:43.217836601 -0600
@@ -21,9 +21,9 @@
* sync everything. Start out by waking pdflush, because that writes back
* all queues in parallel.
*/
-static void do_sync(unsigned long wait)
+static void do_sync(unsigned long wait, nodemask_t *unused)
{
- wakeup_pdflush(0);
+ wakeup_pdflush(0, NULL);
sync_inodes(0); /* All mappings, inodes and their blockdevs */
DQUOT_SYNC(NULL);
sync_supers(); /* Write the superblocks */
@@ -38,13 +38,13 @@ static void do_sync(unsigned long wait)

asmlinkage long sys_sync(void)
{
- do_sync(1);
+ do_sync(1, NULL);
return 0;
}

void emergency_sync(void)
{
- pdflush_operation(do_sync, 0);
+ pdflush_operation(do_sync, 0, NULL);
}

/*
-
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