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SubjectRe: Copying to loop device hangs up everything
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Date

Ok, I'm convinced, given that writers are throttled above the loopback
thread. Follows the Andrea's patch, but against 2.4.17-rc2 + removed
unused gfp_mask parameter of sync_page_buffers.

Regards,
-velco

--- 1.5/fs/buffer.c Tue Dec 18 15:40:18 2001
+++ edited/fs/buffer.c Thu Dec 20 22:45:36 2001
@@ -2432,7 +2432,7 @@
return 1;
}

-static int sync_page_buffers(struct buffer_head *head, unsigned int gfp_mask)
+static int sync_page_buffers(struct buffer_head *head)
{
struct buffer_head * bh = head;
int tryagain = 0;
@@ -2533,9 +2533,10 @@
/* Uhhuh, start writeback so that we don't end up with all dirty pages */
write_unlock(&hash_table_lock);
spin_unlock(&lru_list_lock);
+ gfp_mask = pf_gfp_mask(gfp_mask);
if (gfp_mask & __GFP_IO) {
if ((gfp_mask & __GFP_HIGHIO) || !PageHighMem(page)) {
- if (sync_page_buffers(bh, gfp_mask)) {
+ if (sync_page_buffers(bh)) {
/* no IO or waiting next time */
gfp_mask = 0;
goto cleaned_buffers_try_again;
--- 1.2/include/linux/mm.h Sat Dec 8 02:36:12 2001
+++ edited/include/linux/mm.h Thu Dec 20 22:49:04 2001
@@ -547,6 +547,14 @@
platforms, used as appropriate on others */

#define GFP_DMA __GFP_DMA
+static inline unsigned int pf_gfp_mask(unsigned int gfp_mask)
+{
+ /* avoid all memory balancing I/O methods if this task cannot block on I/O */
+ if (current->flags & PF_NOIO)
+ gfp_mask &= ~(__GFP_IO | __GFP_HIGHIO | __GFP_FS);
+
+ return gfp_mask;
+}

/* vma is the first one with address < vma->vm_end,
* and even address < vma->vm_start. Have to extend vma. */
--- 1.2/mm/vmscan.c Tue Dec 18 15:40:23 2001
+++ edited/mm/vmscan.c Thu Dec 20 22:49:47 2001
@@ -588,6 +588,8 @@
int priority = DEF_PRIORITY;
int nr_pages = SWAP_CLUSTER_MAX;

+ gfp_mask = pf_gfp_mask(gfp_mask);
+
do {
nr_pages = shrink_caches(classzone, priority, gfp_mask, nr_pages);
if (nr_pages <= 0)
-
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