From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
To: linux-kernel@vger.kernel.org, linux-mm@kvack.org
Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>,
linux-xfs@vger.kernel.org, dm-devel@redhat.com,
Mikulas Patocka <mpatocka@redhat.com>,
Jens Axboe <axboe@kernel.dk>, NeilBrown <neilb@suse.de>
Subject: [PATCH 5/6] mm: Replace PF_MEMALLOC_NOIO with memalloc_nocma
Date: Thu, 25 Jun 2020 12:31:21 +0100 [thread overview]
Message-ID: <20200625113122.7540-6-willy@infradead.org> (raw)
In-Reply-To: <20200625113122.7540-1-willy@infradead.org>
We're short on PF_* flags, so make memalloc_nocma its own bit where we
have plenty of space.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
include/linux/sched.h | 2 +-
include/linux/sched/mm.h | 15 +++++++--------
2 files changed, 8 insertions(+), 9 deletions(-)
diff --git a/include/linux/sched.h b/include/linux/sched.h
index eaf36ae1fde2..90336850e940 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -803,6 +803,7 @@ struct task_struct {
#endif
unsigned memalloc_noio:1;
unsigned memalloc_nofs:1;
+ unsigned memalloc_nocma:1;
unsigned long atomic_flags; /* Flags requiring atomic access. */
@@ -1514,7 +1515,6 @@ extern struct pid *cad_pid;
#define PF_UMH 0x02000000 /* I'm an Usermodehelper process */
#define PF_NO_SETAFFINITY 0x04000000 /* Userland is not allowed to meddle with cpus_mask */
#define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */
-#define PF_MEMALLOC_NOCMA 0x10000000 /* All allocation request will have _GFP_MOVABLE cleared */
#define PF_IO_WORKER 0x20000000 /* Task is an IO worker */
#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 */
diff --git a/include/linux/sched/mm.h b/include/linux/sched/mm.h
index 08bc9d0606a8..6f7b59a848a6 100644
--- a/include/linux/sched/mm.h
+++ b/include/linux/sched/mm.h
@@ -175,12 +175,11 @@ static inline bool in_vfork(struct task_struct *tsk)
/*
* Applies per-task gfp context to the given allocation flags.
- * PF_MEMALLOC_NOCMA implies no allocation from CMA region.
*/
static inline gfp_t current_gfp_context(gfp_t flags)
{
- if (unlikely((current->flags & PF_MEMALLOC_NOCMA) ||
- current->memalloc_noio || current->memalloc_nofs)) {
+ if (unlikely(current->memalloc_noio || current->memalloc_nofs ||
+ current->memalloc_nocma)) {
/*
* NOIO implies both NOIO and NOFS and it is a weaker context
* so always make sure it makes precedence
@@ -190,7 +189,8 @@ static inline gfp_t current_gfp_context(gfp_t flags)
else if (current->memalloc_nofs)
flags &= ~__GFP_FS;
#ifdef CONFIG_CMA
- if (current->flags & PF_MEMALLOC_NOCMA)
+ /* memalloc_nocma implies no allocation from movable region */
+ if (current->memalloc_nocma)
flags &= ~__GFP_MOVABLE;
#endif
}
@@ -286,15 +286,14 @@ static inline void memalloc_noreclaim_restore(unsigned int flags)
#ifdef CONFIG_CMA
static inline unsigned int memalloc_nocma_save(void)
{
- unsigned int flags = current->flags & PF_MEMALLOC_NOCMA;
-
- current->flags |= PF_MEMALLOC_NOCMA;
+ unsigned int flags = current->memalloc_nocma;
+ current->memalloc_nocma = 1;
return flags;
}
static inline void memalloc_nocma_restore(unsigned int flags)
{
- current->flags = (current->flags & ~PF_MEMALLOC_NOCMA) | flags;
+ current->memalloc_nocma = flags ? 1 : 0;
}
#else
static inline unsigned int memalloc_nocma_save(void)
--
2.27.0
next prev parent reply other threads:[~2020-06-25 11:31 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-25 11:31 [PATCH 0/6] Overhaul memalloc_no* Matthew Wilcox (Oracle)
2020-06-25 11:31 ` [PATCH 1/6] mm: Replace PF_MEMALLOC_NOIO with memalloc_noio Matthew Wilcox (Oracle)
2020-06-25 12:22 ` Michal Hocko
2020-06-25 12:34 ` Matthew Wilcox
2020-06-25 12:42 ` Michal Hocko
2020-06-25 11:31 ` [PATCH 2/6] mm: Add become_kswapd and restore_kswapd Matthew Wilcox (Oracle)
2020-06-25 12:31 ` Michal Hocko
2020-06-25 11:31 ` [PATCH 3/6] xfs: Convert to memalloc_nofs_save Matthew Wilcox (Oracle)
2020-06-25 11:31 ` [PATCH 4/6] mm: Replace PF_MEMALLOC_NOFS with memalloc_nofs Matthew Wilcox (Oracle)
2020-06-25 13:35 ` Michal Hocko
2020-06-25 11:31 ` Matthew Wilcox (Oracle) [this message]
2020-06-25 11:31 ` [PATCH 6/6] mm: Add memalloc_nowait Matthew Wilcox (Oracle)
2020-06-25 12:40 ` Michal Hocko
2020-06-25 13:10 ` Matthew Wilcox
2020-06-25 13:34 ` Michal Hocko
2020-06-25 19:05 ` kernel test robot
2020-06-25 23:51 ` kernel test robot
2020-06-29 5:08 ` Mike Rapoport
2020-06-29 12:18 ` Matthew Wilcox
2020-06-29 12:52 ` Michal Hocko
2020-06-29 13:45 ` Mike Rapoport
2020-06-29 21:28 ` Matthew Wilcox
2020-06-30 6:34 ` Michal Hocko
2020-07-01 4:12 ` Matthew Wilcox
2020-07-01 5:53 ` Michal Hocko
2020-07-01 7:04 ` Mike Rapoport
2020-09-24 0:39 ` Mike Snitzer
2020-09-24 1:10 ` Matthew Wilcox
2020-10-23 14:49 ` [dm-devel] " Daniel Vetter
2020-06-25 18:48 ` [PATCH 0/6] Overhaul memalloc_no* Darrick J. Wong
2020-06-25 20:34 ` Matthew Wilcox
2020-06-25 20:36 ` Michal Hocko
2020-06-25 20:40 ` Matthew Wilcox
2020-06-26 15:02 ` Mikulas Patocka
2020-06-26 23:08 ` Dave Chinner
2020-06-27 13:09 ` Mikulas Patocka
2020-06-29 0:35 ` Dave Chinner
2020-06-29 13:43 ` Mikulas Patocka
2020-06-29 22:34 ` Dave Chinner
2020-07-03 14:26 ` [PATCH] dm-bufio: do cleanup from a workqueue Mikulas Patocka
2020-06-29 8:22 ` [PATCH 0/6] Overhaul memalloc_no* Michal Hocko
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