The patch titled
Subject: mm: introduce memalloc_retry_wait()
has been added to the -mm tree. Its filename is
mm-introduce-memalloc_retry_wait.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mm-introduce-memalloc_retry_wait.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mm-introduce-memalloc_retry_wait.patch
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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: "NeilBrown" <neilb@xxxxxxx>
Subject: mm: introduce memalloc_retry_wait()
Various places in the kernel - largely in filesystems - respond to a
memory allocation failure by looping around and re-trying. Some of these
cannot conveniently use __GFP_NOFAIL, for reasons such as:
- a GFP_ATOMIC allocation, which __GFP_NOFAIL doesn't work on
- a need to check for the process being signalled between failures
- the possibility that other recovery actions could be performed
- the allocation is quite deep in support code, and passing down an
extra flag to say if __GFP_NOFAIL is wanted would be clumsy.
Many of these currently use congestion_wait() which (in almost all cases)
simply waits the given timeout - congestion isn't tracked for most
devices.
It isn't clear what the best delay is for loops, but it is clear that the
various filesystems shouldn't be responsible for choosing a timeout.
This patch introduces memalloc_retry_wait() with takes on that
responsibility. Code that wants to retry a memory allocation can call
this function passing the GFP flags that were used. It will wait however
is appropriate.
For now, it only considers __GFP_NORETRY and whatever
gfpflags_allow_blocking() tests. If blocking is allowed without
__GFP_NORETRY, then alloc_page either made some reclaim progress, or
waited for a while, before failing. So there is no need for much further
waiting. memalloc_retry_wait() will wait until the current jiffie ends.
If this condition is not met, then alloc_page() won't have waited much if
at all. In that case memalloc_retry_wait() waits about 200ms. This is
the delay that most current loops uses.
linux/sched/mm.h needs to be included in some files now,
but linux/backing-dev.h does not.
Link: https://lkml.kernel.org/r/163754371968.13692.1277530886009912421@xxxxxxxxxxxxxxxxxxxxx
Signed-off-by: NeilBrown <neilb@xxxxxxx>
Cc: Dave Chinner <david@xxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: "Theodore Ts'o" <tytso@xxxxxxx>
Cc: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
Cc: Chao Yu <chao@xxxxxxxxxx>
Cc: Darrick J. Wong <djwong@xxxxxxxxxx>
Cc: Chuck Lever <chuck.lever@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/ext4/extents.c | 8 +++-----
fs/ext4/inline.c | 5 ++---
fs/ext4/page-io.c | 9 +++++----
fs/f2fs/data.c | 4 ++--
fs/f2fs/gc.c | 5 ++---
fs/f2fs/inode.c | 4 ++--
fs/f2fs/node.c | 4 ++--
fs/f2fs/recovery.c | 6 +++---
fs/f2fs/segment.c | 9 +++------
fs/f2fs/super.c | 5 ++---
fs/xfs/kmem.c | 3 +--
fs/xfs/xfs_buf.c | 2 +-
include/linux/sched/mm.h | 26 ++++++++++++++++++++++++++
net/sunrpc/svc_xprt.c | 3 ++-
14 files changed, 56 insertions(+), 37 deletions(-)
--- a/fs/ext4/extents.c~mm-introduce-memalloc_retry_wait
+++ a/fs/ext4/extents.c
@@ -27,8 +27,8 @@
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/fiemap.h>
-#include <linux/backing-dev.h>
#include <linux/iomap.h>
+#include <linux/sched/mm.h>
#include "ext4_jbd2.h"
#include "ext4_extents.h"
#include "xattr.h"
@@ -4407,8 +4407,7 @@ retry:
err = ext4_es_remove_extent(inode, last_block,
EXT_MAX_BLOCKS - last_block);
if (err == -ENOMEM) {
- cond_resched();
- congestion_wait(BLK_RW_ASYNC, HZ/50);
+ memalloc_retry_wait(GFP_ATOMIC);
goto retry;
}
if (err)
@@ -4416,8 +4415,7 @@ retry:
retry_remove_space:
err = ext4_ext_remove_space(inode, last_block, EXT_MAX_BLOCKS - 1);
if (err == -ENOMEM) {
- cond_resched();
- congestion_wait(BLK_RW_ASYNC, HZ/50);
+ memalloc_retry_wait(GFP_ATOMIC);
goto retry_remove_space;
}
return err;
--- a/fs/ext4/inline.c~mm-introduce-memalloc_retry_wait
+++ a/fs/ext4/inline.c
@@ -7,7 +7,7 @@
#include <linux/iomap.h>
#include <linux/fiemap.h>
#include <linux/iversion.h>
-#include <linux/backing-dev.h>
+#include <linux/sched/mm.h>
#include "ext4_jbd2.h"
#include "ext4.h"
@@ -1929,8 +1929,7 @@ int ext4_inline_data_truncate(struct ino
retry:
err = ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
if (err == -ENOMEM) {
- cond_resched();
- congestion_wait(BLK_RW_ASYNC, HZ/50);
+ memalloc_retry_wait(GFP_ATOMIC);
goto retry;
}
if (err)
--- a/fs/ext4/page-io.c~mm-introduce-memalloc_retry_wait
+++ a/fs/ext4/page-io.c
@@ -24,7 +24,7 @@
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/mm.h>
-#include <linux/backing-dev.h>
+#include <linux/sched/mm.h>
#include "ext4_jbd2.h"
#include "xattr.h"
@@ -523,12 +523,13 @@ int ext4_bio_write_page(struct ext4_io_s
ret = PTR_ERR(bounce_page);
if (ret == -ENOMEM &&
(io->io_bio || wbc->sync_mode == WB_SYNC_ALL)) {
- gfp_flags = GFP_NOFS;
+ gfp_t new_gfp_flags = GFP_NOFS;
if (io->io_bio)
ext4_io_submit(io);
else
- gfp_flags |= __GFP_NOFAIL;
- congestion_wait(BLK_RW_ASYNC, HZ/50);
+ new_gfp_flags |= __GFP_NOFAIL;
+ memalloc_retry_wait(gfp_flags);
+ gfp_flags = new_gfp_flags;
goto retry_encrypt;
}
--- a/fs/f2fs/data.c~mm-introduce-memalloc_retry_wait
+++ a/fs/f2fs/data.c
@@ -8,9 +8,9 @@
#include <linux/fs.h>
#include <linux/f2fs_fs.h>
#include <linux/buffer_head.h>
+#include <linux/sched/mm.h>
#include <linux/mpage.h>
#include <linux/writeback.h>
-#include <linux/backing-dev.h>
#include <linux/pagevec.h>
#include <linux/blkdev.h>
#include <linux/bio.h>
@@ -2542,7 +2542,7 @@ retry_encrypt:
/* flush pending IOs and wait for a while in the ENOMEM case */
if (PTR_ERR(fio->encrypted_page) == -ENOMEM) {
f2fs_flush_merged_writes(fio->sbi);
- congestion_wait(BLK_RW_ASYNC, DEFAULT_IO_TIMEOUT);
+ memalloc_retry_wait(GFP_NOFS);
gfp_flags |= __GFP_NOFAIL;
goto retry_encrypt;
}
--- a/fs/f2fs/gc.c~mm-introduce-memalloc_retry_wait
+++ a/fs/f2fs/gc.c
@@ -7,7 +7,6 @@
*/
#include <linux/fs.h>
#include <linux/module.h>
-#include <linux/backing-dev.h>
#include <linux/init.h>
#include <linux/f2fs_fs.h>
#include <linux/kthread.h>
@@ -15,6 +14,7 @@
#include <linux/freezer.h>
#include <linux/sched/signal.h>
#include <linux/random.h>
+#include <linux/sched/mm.h>
#include "f2fs.h"
#include "node.h"
@@ -1375,8 +1375,7 @@ retry:
if (err) {
clear_page_private_gcing(page);
if (err == -ENOMEM) {
- congestion_wait(BLK_RW_ASYNC,
- DEFAULT_IO_TIMEOUT);
+ memalloc_retry_wait(GFP_NOFS);
goto retry;
}
if (is_dirty)
--- a/fs/f2fs/inode.c~mm-introduce-memalloc_retry_wait
+++ a/fs/f2fs/inode.c
@@ -8,8 +8,8 @@
#include <linux/fs.h>
#include <linux/f2fs_fs.h>
#include <linux/buffer_head.h>
-#include <linux/backing-dev.h>
#include <linux/writeback.h>
+#include <linux/sched/mm.h>
#include "f2fs.h"
#include "node.h"
@@ -562,7 +562,7 @@ retry:
inode = f2fs_iget(sb, ino);
if (IS_ERR(inode)) {
if (PTR_ERR(inode) == -ENOMEM) {
- congestion_wait(BLK_RW_ASYNC, DEFAULT_IO_TIMEOUT);
+ memalloc_retry_wait(GFP_NOFS);
goto retry;
}
}
--- a/fs/f2fs/node.c~mm-introduce-memalloc_retry_wait
+++ a/fs/f2fs/node.c
@@ -8,7 +8,7 @@
#include <linux/fs.h>
#include <linux/f2fs_fs.h>
#include <linux/mpage.h>
-#include <linux/backing-dev.h>
+#include <linux/sched/mm.h>
#include <linux/blkdev.h>
#include <linux/pagevec.h>
#include <linux/swap.h>
@@ -2750,7 +2750,7 @@ int f2fs_recover_inode_page(struct f2fs_
retry:
ipage = f2fs_grab_cache_page(NODE_MAPPING(sbi), ino, false);
if (!ipage) {
- congestion_wait(BLK_RW_ASYNC, DEFAULT_IO_TIMEOUT);
+ memalloc_retry_wait(GFP_NOFS);
goto retry;
}
--- a/fs/f2fs/recovery.c~mm-introduce-memalloc_retry_wait
+++ a/fs/f2fs/recovery.c
@@ -8,6 +8,7 @@
#include <asm/unaligned.h>
#include <linux/fs.h>
#include <linux/f2fs_fs.h>
+#include <linux/sched/mm.h>
#include "f2fs.h"
#include "node.h"
#include "segment.h"
@@ -587,7 +588,7 @@ retry_dn:
err = f2fs_get_dnode_of_data(&dn, start, ALLOC_NODE);
if (err) {
if (err == -ENOMEM) {
- congestion_wait(BLK_RW_ASYNC, DEFAULT_IO_TIMEOUT);
+ memalloc_retry_wait(GFP_NOFS);
goto retry_dn;
}
goto out;
@@ -670,8 +671,7 @@ retry_prev:
err = check_index_in_prev_nodes(sbi, dest, &dn);
if (err) {
if (err == -ENOMEM) {
- congestion_wait(BLK_RW_ASYNC,
- DEFAULT_IO_TIMEOUT);
+ memalloc_retry_wait(GFP_NOFS);
goto retry_prev;
}
goto err;
--- a/fs/f2fs/segment.c~mm-introduce-memalloc_retry_wait
+++ a/fs/f2fs/segment.c
@@ -9,6 +9,7 @@
#include <linux/f2fs_fs.h>
#include <linux/bio.h>
#include <linux/blkdev.h>
+#include <linux/sched/mm.h>
#include <linux/prefetch.h>
#include <linux/kthread.h>
#include <linux/swap.h>
@@ -245,9 +246,7 @@ retry:
LOOKUP_NODE);
if (err) {
if (err == -ENOMEM) {
- congestion_wait(BLK_RW_ASYNC,
- DEFAULT_IO_TIMEOUT);
- cond_resched();
+ memalloc_retry_wait(GFP_NOFS);
goto retry;
}
err = -EAGAIN;
@@ -424,9 +423,7 @@ retry:
err = f2fs_do_write_data_page(&fio);
if (err) {
if (err == -ENOMEM) {
- congestion_wait(BLK_RW_ASYNC,
- DEFAULT_IO_TIMEOUT);
- cond_resched();
+ memalloc_retry_wait(GFP_NOFS);
goto retry;
}
unlock_page(page);
--- a/fs/f2fs/super.c~mm-introduce-memalloc_retry_wait
+++ a/fs/f2fs/super.c
@@ -8,9 +8,9 @@
#include <linux/module.h>
#include <linux/init.h>
#include <linux/fs.h>
+#include <linux/sched/mm.h>
#include <linux/statfs.h>
#include <linux/buffer_head.h>
-#include <linux/backing-dev.h>
#include <linux/kthread.h>
#include <linux/parser.h>
#include <linux/mount.h>
@@ -2415,8 +2415,7 @@ repeat:
page = read_cache_page_gfp(mapping, blkidx, GFP_NOFS);
if (IS_ERR(page)) {
if (PTR_ERR(page) == -ENOMEM) {
- congestion_wait(BLK_RW_ASYNC,
- DEFAULT_IO_TIMEOUT);
+ memalloc_retry_wait(GFP_NOFS);
goto repeat;
}
set_sbi_flag(F2FS_SB(sb), SBI_QUOTA_NEED_REPAIR);
--- a/fs/xfs/kmem.c~mm-introduce-memalloc_retry_wait
+++ a/fs/xfs/kmem.c
@@ -4,7 +4,6 @@
* All Rights Reserved.
*/
#include "xfs.h"
-#include <linux/backing-dev.h>
#include "xfs_message.h"
#include "xfs_trace.h"
@@ -26,6 +25,6 @@ kmem_alloc(size_t size, xfs_km_flags_t f
"%s(%u) possible memory allocation deadlock size %u in %s (mode:0x%x)",
current->comm, current->pid,
(unsigned int)size, __func__, lflags);
- congestion_wait(BLK_RW_ASYNC, HZ/50);
+ memalloc_retry_wait(lflags);
} while (1);
}
--- a/fs/xfs/xfs_buf.c~mm-introduce-memalloc_retry_wait
+++ a/fs/xfs/xfs_buf.c
@@ -394,7 +394,7 @@ xfs_buf_alloc_pages(
}
XFS_STATS_INC(bp->b_mount, xb_page_retries);
- congestion_wait(BLK_RW_ASYNC, HZ / 50);
+ memalloc_retry_wait(gfp_mask);
}
return 0;
}
--- a/include/linux/sched/mm.h~mm-introduce-memalloc_retry_wait
+++ a/include/linux/sched/mm.h
@@ -214,6 +214,32 @@ static inline void fs_reclaim_acquire(gf
static inline void fs_reclaim_release(gfp_t gfp_mask) { }
#endif
+/* Any memory-allocation retry loop should use
+ * memalloc_retry_wait(), and pass the flags for the most
+ * constrained allocation attempt that might have failed.
+ * This provides useful documentation of where loops are,
+ * and a central place to fine tune the waiting as the MM
+ * implementation changes.
+ */
+static inline void memalloc_retry_wait(gfp_t gfp_flags)
+{
+ /* We use io_schedule_timeout because waiting for memory
+ * typically included waiting for dirty pages to be
+ * written out, which requires IO.
+ */
+ __set_current_state(TASK_UNINTERRUPTIBLE);
+ gfp_flags = current_gfp_context(gfp_flags);
+ if (gfpflags_allow_blocking(gfp_flags) &&
+ !(gfp_flags & __GFP_NORETRY))
+ /* Probably waited already, no need for much more */
+ io_schedule_timeout(1);
+ else
+ /* Probably didn't wait, and has now released a lock,
+ * so now is a good time to wait
+ */
+ io_schedule_timeout(HZ/50);
+}
+
/**
* might_alloc - Mark possible allocation sites
* @gfp_mask: gfp_t flags that would be used to allocate
--- a/net/sunrpc/svc_xprt.c~mm-introduce-memalloc_retry_wait
+++ a/net/sunrpc/svc_xprt.c
@@ -6,6 +6,7 @@
*/
#include <linux/sched.h>
+#include <linux/sched/mm.h>
#include <linux/errno.h>
#include <linux/freezer.h>
#include <linux/kthread.h>
@@ -688,7 +689,7 @@ static int svc_alloc_arg(struct svc_rqst
return -EINTR;
}
trace_svc_alloc_arg_err(pages);
- schedule_timeout(msecs_to_jiffies(500));
+ memalloc_retry_wait(GFP_KERNEL);
}
rqstp->rq_page_end = &rqstp->rq_pages[pages];
rqstp->rq_pages[pages] = NULL; /* this might be seen in nfsd_splice_actor() */
_
Patches currently in -mm which might be from neilb@xxxxxxx are
mm-discard-__gfp_atomic.patch
mm-introduce-memalloc_retry_wait.patch
