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Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block

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* 'for-linus' of git://git.kernel.dk/linux-2.6-block:
  Revert "mm: add /proc controls for pdflush threads"
  viocd: needs to depend on BLOCK
  block: fix the bio_vec array index out-of-bounds test
This commit is contained in:
Linus Torvalds
2009-05-15 08:05:37 -07:00
parent 662f11cf2a cd17cbfda0
commit c653849981
6 changed files with 15 additions and 74 deletions
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31
mm/pdflush.c
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@@ -57,14 +57,6 @@ static DEFINE_SPINLOCK(pdflush_lock);
*/
int nr_pdflush_threads = 0;
/*
* The max/min number of pdflush threads. R/W by sysctl at
* /proc/sys/vm/nr_pdflush_threads_max/min
*/
int nr_pdflush_threads_max __read_mostly = MAX_PDFLUSH_THREADS;
int nr_pdflush_threads_min __read_mostly = MIN_PDFLUSH_THREADS;
/*
* The time at which the pdflush thread pool last went empty
*/
@@ -76,7 +68,7 @@ static unsigned long last_empty_jifs;
* Thread pool management algorithm:
*
* - The minimum and maximum number of pdflush instances are bound
* by nr_pdflush_threads_min and nr_pdflush_threads_max.
* by MIN_PDFLUSH_THREADS and MAX_PDFLUSH_THREADS.
*
* - If there have been no idle pdflush instances for 1 second, create
* a new one.
@@ -142,13 +134,14 @@ static int __pdflush(struct pdflush_work *my_work)
* To throttle creation, we reset last_empty_jifs.
*/
if (time_after(jiffies, last_empty_jifs + 1 * HZ)) {
if (list_empty(&pdflush_list) &&
nr_pdflush_threads < nr_pdflush_threads_max) {
last_empty_jifs = jiffies;
nr_pdflush_threads++;
spin_unlock_irq(&pdflush_lock);
start_one_pdflush_thread();
spin_lock_irq(&pdflush_lock);
if (list_empty(&pdflush_list)) {
if (nr_pdflush_threads < MAX_PDFLUSH_THREADS) {
last_empty_jifs = jiffies;
nr_pdflush_threads++;
spin_unlock_irq(&pdflush_lock);
start_one_pdflush_thread();
spin_lock_irq(&pdflush_lock);
}
}
}
@@ -160,7 +153,7 @@ static int __pdflush(struct pdflush_work *my_work)
*/
if (list_empty(&pdflush_list))
continue;
if (nr_pdflush_threads <= nr_pdflush_threads_min)
if (nr_pdflush_threads <= MIN_PDFLUSH_THREADS)
continue;
pdf = list_entry(pdflush_list.prev, struct pdflush_work, list);
if (time_after(jiffies, pdf->when_i_went_to_sleep + 1 * HZ)) {
@@ -266,9 +259,9 @@ static int __init pdflush_init(void)
* Pre-set nr_pdflush_threads... If we fail to create,
* the count will be decremented.
*/
nr_pdflush_threads = nr_pdflush_threads_min;
nr_pdflush_threads = MIN_PDFLUSH_THREADS;
for (i = 0; i < nr_pdflush_threads_min; i++)
for (i = 0; i < MIN_PDFLUSH_THREADS; i++)
start_one_pdflush_thread();
return 0;
}