WSL2-Linux-Kernel/net
NeilBrown 4034247a0d 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@noble.neil.brown.name
Signed-off-by: NeilBrown <neilb@suse.de>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: Jaegeuk Kim <jaegeuk@kernel.org>
Cc: Chao Yu <chao@kernel.org>
Cc: Darrick J. Wong <djwong@kernel.org>
Cc: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2022-01-15 16:30:29 +02:00
..
6lowpan
9p 9p: fix a bunch of checkpatch warnings 2021-11-04 21:04:25 +09:00
802 llc/snap: constify dev_addr passing 2021-10-13 09:40:46 -07:00
8021q net: vlan: fix underflow for the real_dev refcnt 2021-11-26 11:20:46 -08:00
appletalk
atm net: atm: use address setting helpers 2021-10-24 13:59:45 +01:00
ax25 ax25: NPD bug when detaching AX25 device 2021-12-18 12:33:56 +00:00
batman-adv batman-adv: mcast: don't send link-local multicast to mcast routers 2022-01-02 09:31:17 +01:00
bluetooth bluetooth: use dev_addr_set() 2021-10-25 11:01:29 -07:00
bpf bpf: Add dummy BPF STRUCT_OPS for test purpose 2021-11-01 14:10:00 -07:00
bpfilter
bridge net: bridge: mcast: fix br_multicast_ctx_vlan_global_disabled helper 2021-12-29 17:49:45 -08:00
caif net: caif: get ready for const netdev->dev_addr 2021-10-24 13:59:45 +01:00
can can: j1939: j1939_tp_cmd_recv(): check the dst address of TP.CM_BAM 2021-11-06 17:29:32 +01:00
ceph mm: allow !GFP_KERNEL allocations for kvmalloc 2022-01-15 16:30:29 +02:00
core lwtunnel: Validate RTA_ENCAP_TYPE attribute length 2021-12-31 14:31:59 +00:00
dcb
dccp tcp: switch orphan_count to bare per-cpu counters 2021-10-15 11:28:34 +01:00
decnet
dns_resolver
dsa net: dsa: tag_ocelot: use traffic class to map priority on injected header 2021-12-23 09:44:59 -08:00
ethernet eth: platform: add a helper for loading netdev->dev_addr 2021-10-08 14:54:33 +01:00
ethtool ethtool: do not perform operations on net devices being unregistered 2021-12-06 16:53:32 -08:00
hsr net: hsr: Add support for redbox supervision frames 2021-10-26 14:52:17 +01:00
ieee802154 mac802154: use dev_addr_set() - manual 2021-10-20 14:27:40 +01:00
ife
ipv4 lwtunnel: Validate RTA_ENCAP_TYPE attribute length 2021-12-31 14:31:59 +00:00
ipv6 udp6: Use Segment Routing Header for dest address if present 2022-01-04 12:17:35 +00:00
iucv
kcm
key
l2tp
l3mdev
lapb
llc llc/snap: constify dev_addr passing 2021-10-13 09:40:46 -07:00
mac80211 mac80211: mesh: embedd mesh_paths and mpp_paths into ieee80211_if_mesh 2022-01-04 15:11:49 +01:00
mac802154 mac802154: use dev_addr_set() - manual 2021-10-20 14:27:40 +01:00
mctp mctp: Remove only static neighbour on RTM_DELNEIGH 2022-01-02 12:18:14 +00:00
mpls net: mpls: Remove rcu protection from nh_dev 2021-11-29 12:39:42 +00:00
mptcp mptcp: fix deadlock in __mptcp_push_pending() 2021-12-14 18:49:40 -08:00
ncsi net/ncsi: check for error return from call to nla_put_u32 2021-12-29 17:53:24 -08:00
netfilter netfilter: ctnetlink: remove expired entries first 2021-12-16 14:10:52 +01:00
netlabel
netlink net: netlink: af_netlink: Prevent empty skb by adding a check on len. 2021-11-30 17:45:01 -08:00
netrom netrom: fix copying in user data in nr_setsockopt 2022-01-04 12:36:01 +00:00
nfc nfc: fix potential NULL pointer deref in nfc_genl_dump_ses_done 2021-12-09 07:50:32 -08:00
nsh
openvswitch net: openvswitch: Fix matching zone id for invalid conns arriving from tc 2021-12-17 18:06:36 -08:00
packet net/packet: rx_owner_map depends on pg_vec 2021-12-15 17:49:36 -08:00
phonet phonet/pep: refuse to enable an unbound pipe 2021-12-20 11:49:51 +00:00
psample
qrtr net: qrtr: combine nameservice into main module 2021-09-28 17:36:43 -07:00
rds rds: memory leak in __rds_conn_create() 2021-12-14 12:51:52 +00:00
rfkill
rose rose: constify dev_addr passing 2021-10-13 09:40:45 -07:00
rxrpc rxrpc: Fix rxrpc_local leak in rxrpc_lookup_peer() 2021-11-29 15:40:02 +00:00
sched sch_qfq: prevent shift-out-of-bounds in qfq_init_qdisc 2022-01-04 12:36:51 +00:00
sctp sctp: hold endpoint before calling cb in sctp_transport_lookup_process 2022-01-02 12:46:41 +00:00
smc net/smc: fix kernel panic caused by race of smc_sock 2021-12-28 12:42:45 +00:00
strparser bpf: sockmap, strparser, and tls are reusing qdisc_skb_cb and colliding 2021-11-09 01:05:28 +01:00
sunrpc mm: introduce memalloc_retry_wait() 2022-01-15 16:30:29 +02:00
switchdev net: switchdev: merge switchdev_handle_fdb_{add,del}_to_device 2021-10-27 14:54:02 +01:00
tipc net ticp:fix a kernel-infoleak in __tipc_sendmsg() 2021-12-31 18:37:08 -08:00
tls net/tls: Fix authentication failure in CCM mode 2021-11-29 12:48:28 +00:00
unix af_unix: fix regression in read after shutdown 2021-11-20 15:10:30 +00:00
vmw_vsock virtio/vsock: fix the transport to work with VMADDR_CID_ANY 2021-12-08 15:41:50 -05:00
wireless cfg80211: Acquire wiphy mutex on regulatory work 2021-12-14 11:20:11 +01:00
x25
xdp Merge https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf 2021-12-31 18:35:54 -08:00
xfrm Core: 2021-11-02 06:20:58 -07:00
Kconfig net/core: disable NET_RX_BUSY_POLL on PREEMPT_RT 2021-10-01 15:45:10 -07:00
Makefile
compat.c
devres.c
socket.c
sysctl_net.c sections: move and rename core_kernel_data() to is_kernel_core_data() 2021-11-09 10:02:50 -08:00