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SubjectRe: Updated Linux 2.4 Status/TODO List (from the ALS show)
> 9. To Do
> * mm->rss is modified in some places without holding the
> page_table_lock (sct)

Any of the mm gurus give the patch below a quick once over ?
Is this adequate, or is there more to this than the description implies?

regards,

Dave.

--
| Dave Jones <davej@suse.de> http://www.suse.de/~davej
| SuSE Labs


diff -urN --exclude-from=/home/davej/.exclude linux/mm/memory.c linux.dj/mm/memory.c
--- linux/mm/memory.c Sat Sep 16 00:51:21 2000
+++ linux.dj/mm/memory.c Wed Oct 11 23:41:10 2000
@@ -370,7 +370,6 @@
address = (address + PGDIR_SIZE) & PGDIR_MASK;
dir++;
} while (address && (address < end));
- spin_unlock(&mm->page_table_lock);
/*
* Update rss for the mm_struct (not necessarily current->mm)
* Notice that rss is an unsigned long.
@@ -379,6 +378,7 @@
mm->rss -= freed;
else
mm->rss = 0;
+ spin_unlock(&mm->page_table_lock);
}


@@ -1074,7 +1074,9 @@
flush_icache_page(vma, page);
}

+ spin_lock(&mm->page_table_lock);
mm->rss++;
+ spin_unlock(&mm->page_table_lock);

pte = mk_pte(page, vma->vm_page_prot);

@@ -1113,7 +1115,9 @@
return -1;
clear_user_highpage(page, addr);
entry = pte_mkwrite(pte_mkdirty(mk_pte(page, vma->vm_page_prot)));
+ spin_lock(&mm->page_table_lock);
mm->rss++;
+ spin_unlock(&mm->page_table_lock);
flush_page_to_ram(page);
}
set_pte(page_table, entry);
@@ -1152,7 +1156,9 @@
return 0;
if (new_page == NOPAGE_OOM)
return -1;
+ spin_lock(&mm->page_table_lock);
++mm->rss;
+ spin_unlock(&mm->page_table_lock);
/*
* This silly early PAGE_DIRTY setting removes a race
* due to the bad i386 page protection. But it's valid
diff -urN --exclude-from=/home/davej/.exclude linux/mm/mmap.c linux.dj/mm/mmap.c
--- linux/mm/mmap.c Tue Aug 29 20:41:12 2000
+++ linux.dj/mm/mmap.c Wed Oct 11 23:48:30 2000
@@ -844,7 +844,9 @@
vmlist_modify_lock(mm);
mm->mmap = mm->mmap_avl = mm->mmap_cache = NULL;
vmlist_modify_unlock(mm);
+ spin_lock (&mm->page_table_lock);
mm->rss = 0;
+ spin_unlock (&mm->page_table_lock);
mm->total_vm = 0;
mm->locked_vm = 0;
while (mpnt) {
diff -urN --exclude-from=/home/davej/.exclude linux/mm/vmscan.c linux.dj/mm/vmscan.c
--- linux/mm/vmscan.c Mon Oct 2 20:02:20 2000
+++ linux.dj/mm/vmscan.c Wed Oct 11 23:46:01 2000
@@ -102,7 +102,9 @@
set_pte(page_table, swp_entry_to_pte(entry));
drop_pte:
UnlockPage(page);
+ spin_lock (&mm->page_table_lock);
mm->rss--;
+ spin_unlock (&mm->page_table_lock);
flush_tlb_page(vma, address);
deactivate_page(page);
page_cache_release(page);
@@ -170,7 +172,9 @@
struct file *file = vma->vm_file;
if (file) get_file(file);
pte_clear(page_table);
+ spin_lock (&mm->page_table_lock);
mm->rss--;
+ spin_unlock (&mm->page_table_lock);
flush_tlb_page(vma, address);
vmlist_access_unlock(mm);
error = swapout(page, file);
@@ -202,7 +206,9 @@
add_to_swap_cache(page, entry);

/* Put the swap entry into the pte after the page is in swapcache */
+ spin_lock (&mm->page_table_lock);
mm->rss--;
+ spin_unlock (&mm->page_table_lock);
set_pte(page_table, swp_entry_to_pte(entry));
flush_tlb_page(vma, address);
vmlist_access_unlock(mm);
-
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