On Mon 09-01-17 13:59:05, Vlastimil Babka wrote:

On 01/06/2017 03:11 PM, Michal Hocko wrote:

quoted

From: Michal Hocko <mhocko@suse.com>

xfs has defined PF_FSTRANS to declare a scope GFP_NOFS semantic quite
some time ago. We would like to make this concept more generic and use
it for other filesystems as well. Let's start by giving the flag a
more generic name PF_MEMALLOC_NOFS which is in line with an exiting
PF_MEMALLOC_NOIO already used for the same purpose for GFP_NOIO
contexts. Replace all PF_FSTRANS usage from the xfs code in the first
step before we introduce a full API for it as xfs uses the flag directly
anyway.

This patch doesn't introduce any functional change.

Signed-off-by: Michal Hocko <mhocko@suse.com>
Reviewed-by: Brian Foster <redacted>

Acked-by: Vlastimil Babka <redacted>

Thanks!

A nit:

quoted

--- a/include/linux/sched.h
+++ b/include/linux/sched.h

@@ -2320,6 +2320,8 @@ extern void thread_group_cputime_adjusted(struct task_struct *p, cputime_t *ut,
 #define PF_FREEZER_SKIP	0x40000000	/* Freezer should not count it as freezable */
 #define PF_SUSPEND_TASK 0x80000000      /* this thread called freeze_processes and should not be frozen */
 
+#define PF_MEMALLOC_NOFS PF_FSTRANS	/* Transition to a more generic GFP_NOFS scope semantic */

I don't see why this transition is needed, as there are already no users
of PF_FSTRANS after this patch. The next patch doesn't remove any more,
so this is just extra churn IMHO. But not a strong objection.

I just wanted to have this transparent for the xfs in this patch.
AFAIR Dave wanted to have xfs and generic parts separated. So it was the
easiest to simply keep the flag and then remove it in a separate patach.

-- 
Michal Hocko
SUSE Labs

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