linux-kernel - Re: [RFC 1/3] SGI Altix cross partition memory (XPMEM)

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Date:	Thu, 9 Aug 2007 20:11:04 -0500
From:	Dean Nelson <dcn@....com>
To:	linux-ia64@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, tony.luck@...el.com, jes@....com
Subject: Re: [RFC 1/3] SGI Altix cross partition memory (XPMEM)

This patch exports __put_task_struct as it is needed by XPMEM.

Signed-off-by: Dean Nelson <dcn@....com>

---

One struct file_operations registered by XPMEM, xpmem_open(), calls
'get_task_struct(current->group_leader)' and another, xpmem_flush(), calls
'put_task_struct(tg->group_leader)'. The reason for this is given in the
comment block that appears in xpmem_open().

        /*
         * Increment 'usage' and 'mm->mm_users' for the current task's thread
         * group leader. This ensures that both its task_struct and mm_struct
         * will still be around when our thread group exits. (The Linux kernel
         * normally tears down the mm_struct prior to calling a module's
         * 'flush' function.) Since all XPMEM thread groups must go through
         * this path, this extra reference to mm_users also allows us to
         * directly inc/dec mm_users in xpmem_ensure_valid_PFNs() and avoid
         * mmput() which has a scaling issue with the mmlist_lock.
         */

Index: linux-2.6/kernel/fork.c
===================================================================
--- linux-2.6.orig/kernel/fork.c	2007-08-09 07:07:55.426611601 -0500
+++ linux-2.6/kernel/fork.c	2007-08-09 07:15:43.246391700 -0500
@@ -127,6 +127,7 @@
 	if (!profile_handoff_task(tsk))
 		free_task(tsk);
 }
+EXPORT_SYMBOL_GPL(__put_task_struct);
 
 void __init fork_init(unsigned long mempages)
 {
-
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