Re: [patch 4/4] ipc: sem optimise simple operations
From: Manfred Spraul
Date: Tue Aug 11 2009 - 14:18:51 EST
On 08/11/2009 01:09 PM, npiggin@xxxxxxx wrote:
Index: linux-2.6/include/linux/sem.h
===================================================================
--- linux-2.6.orig/include/linux/sem.h
+++ linux-2.6/include/linux/sem.h
@@ -86,6 +86,8 @@ struct task_struct;
struct sem {
int semval; /* current value */
int sempid; /* pid of last operation */
+ struct list_head negv_pending;
+ struct list_head zero_pending;
};
struct sem is increased from 8 to 24 bytes.
Is that still ok? Are there any apps that use really lots of semaphores
(i.e.: far more than processes in the system?)
Postgres uses lots of small semaphore sets (each with 17 entries), I
never had access to other apps.
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