Re: [Patch] Scale pidhash_shift/pidhash_size up based onnum_possible_cpus().

[Robin Holt]

Like so???

I have not tested this yet.

---

Set the upper limit for the pidhash_shift based upon PID_MAX_LIMIT.

Signed-off-by: Robin Holt <holt@xxxxxxx>


Index: contention_unroll/kernel/pid.c
===================================================================
--- contention_unroll.orig/kernel/pid.c	2008-07-31 11:59:21.154284073 -0500
+++ contention_unroll/kernel/pid.c	2008-07-31 15:07:21.909158788 -0500
@@ -504,7 +504,7 @@ void __init pidhash_init(void)
 	unsigned long megabytes = nr_kernel_pages >> (20 - PAGE_SHIFT);
 
 	pidhash_shift = max(4, fls(megabytes * 4));
-	pidhash_shift = min(12, pidhash_shift);
+	pidhash_shift = min(fls(PID_MAX_LIMIT) - 6, pidhash_shift);
 	pidhash_size = 1 << pidhash_shift;
 
 	printk("PID hash table entries: %d (order: %d, %Zd bytes)\n",
--
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