On Sat, August 12, 2006 20:08, Peter Zijlstra said:
> On Sat, 2006-08-12 at 19:54 +0200, Indan Zupancic wrote:
>> True, but currently memalloc_reserve isn't used in a sensible way,
>> or I'm missing something.
>
> Well, I'm somewhat reluctant to stick network related code into mm/, it
> seems well separated now.
What I had in mind was something like:
+static DEFINE_SPINLOCK(memalloc_lock);
+static int memalloc_socks;
+
+atomic_t memalloc_skbs_used;
+EXPORT_SYMBOL_GPL(memalloc_skbs_used);
+
+int sk_adjust_memalloc(int nr_socks)
+{
+ unsigned long flags;
+ unsigned int reserve;
+ int err;
+
+ spin_lock_irqsave(&memalloc_lock, flags);
+
+ memalloc_socks += nr_socks;
+ BUG_ON(memalloc_socks < 0);
+
+ reserve = nr_socks * (2 * MAX_PHYS_SEGMENTS + /* outbound */
+ 5 * MAX_CONCURRENT_SKBS); /* inbound */
+
+ err = adjust_memalloc_reserve(reserve);
+ spin_unlock_irqrestore(&memalloc_lock, flags);
+ if (err) {
+ printk(KERN_WARNING
+ "Unable to change RX reserve to: %lu, error: %d\n",
+ reserve, err);
+ }
+ return err;
+}
The original code missed the brackets, so 5 * MAX_CONCURRENT_SKBS wasn't done
per socket. But the comment said it was per socket, so I added in this version.
Greetings,
Indan
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