Tejun Heo
839a8e8660
writeback: replace custom worker pool implementation with unbound workqueue ...
Writeback implements its own worker pool - each bdi can be associated
with a worker thread which is created and destroyed dynamically. The
worker thread for the default bdi is always present and serves as the
"forker" thread which forks off worker threads for other bdis.
there's no reason for writeback to implement its own worker pool when
using unbound workqueue instead is much simpler and more efficient.
This patch replaces custom worker pool implementation in writeback
with an unbound workqueue.
The conversion isn't too complicated but the followings are worth
mentioning.
* bdi_writeback->last_active, task and wakeup_timer are removed.
delayed_work ->dwork is added instead. Explicit timer handling is
no longer necessary. Everything works by either queueing / modding
/ flushing / canceling the delayed_work item.
* bdi_writeback_thread() becomes bdi_writeback_workfn() which runs off
bdi_writeback->dwork. On each execution, it processes
bdi->work_list and reschedules itself if there are more things to
do.
The function also handles low-mem condition, which used to be
handled by the forker thread. If the function is running off a
rescuer thread, it only writes out limited number of pages so that
the rescuer can serve other bdis too. This preserves the flusher
creation failure behavior of the forker thread.
* INIT_LIST_HEAD(&bdi->bdi_list) is used to tell
bdi_writeback_workfn() about on-going bdi unregistration so that it
always drains work_list even if it's running off the rescuer. Note
that the original code was broken in this regard. Under memory
pressure, a bdi could finish unregistration with non-empty
work_list.
* The default bdi is no longer special. It now is treated the same as
any other bdi and bdi_cap_flush_forker() is removed.
* BDI_pending is no longer used. Removed.
* Some tracepoints become non-applicable. The following TPs are
removed - writeback_nothread, writeback_wake_thread,
writeback_wake_forker_thread, writeback_thread_start,
writeback_thread_stop.
Everything, including devices coming and going away and rescuer
operation under simulated memory pressure, seems to work fine in my
test setup.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Jan Kara <jack@suse.cz>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Fengguang Wu <fengguang.wu@intel.com>
Cc: Jeff Moyer <jmoyer@redhat.com>
2013-04-01 19:08:06 -07:00
Merge branch 'next' of git://git.infradead.org/users/vkoul/slave-dma
2013-02-26 09:24:48 -08:00
Fairly unexciting MTD merge for 3.9:
2013-03-02 16:33:54 -08:00
libceph: add support for HASHPSPOOL pool flag
2013-02-26 15:03:06 -08:00
arm-soc: soc-specific updates
2013-02-21 15:27:22 -08:00
extcon: gpio: Rename filename of extcon-gpio.c according to kernel naming style
2013-02-13 08:35:43 -08:00
hsi: fix kernel-doc warnings
2013-03-01 13:39:00 -08:00
Input: atmel_mxt_ts - Support for touchpad variant
2013-03-08 16:03:29 -08:00
iio: Fix build error seen if IIO_TRIGGER is defined but IIO_BUFFER is not
2013-03-02 16:31:21 +00:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
2013-02-20 11:00:43 -08:00
ImgTec Meta architecture changes for v3.9-rc1
2013-03-03 12:06:09 -08:00
Merge branch 'for-3.9' of git://linux-nfs.org/~bfields/linux
2013-02-28 18:02:55 -08:00
char/misc driver fixes for 3.9-rc4
2013-03-28 15:51:33 -07:00
Main batch of InfiniBand/RDMA changes for 3.9:
2013-02-26 11:41:08 -08:00
mmc: sh_mobile_sdhi: remove unused .pdata field
2013-02-24 14:37:22 -05:00
mtd: nand: reintroduce NAND_NO_READRDY as NAND_NEED_READRDY
2013-03-14 12:48:54 +00:00
Merge branch 'master' of git://1984.lsi.us.es/nf
2013-02-26 17:24:26 -05:00
nfsd: Store ex_anon_uid and ex_anon_gid as kuids and kgids
2013-02-13 06:16:08 -08:00
pinctrl: generic: rename input schmitt disable
2013-02-15 09:52:29 +01:00
Fairly unexciting MTD merge for 3.9:
2013-03-02 16:33:54 -08:00
bq2415x_charger: Add support for offline and 100mA mode
2013-02-16 13:34:10 -08:00
regulator: core: update kernel documentation for regulator_desc
2013-03-01 06:07:22 +00:00
sched: move RR_TIMESLICE from sysctl.h to rt.h
2013-02-22 09:20:11 -08:00
Staging tree update for 3.9-rc1
2013-02-21 12:11:44 -08:00
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next into for-davem
2013-02-08 13:16:17 -05:00
NFS client bugfixes for Linux 3.9
2013-03-02 16:46:07 -08:00
usb: add find_raw_port_number callback to struct hc_driver()
2013-03-25 10:39:17 -07:00
x86, ACPI, mm: Revert movablemem_map support
2013-03-02 09:34:39 -08:00
writeback: replace custom worker pool implementation with unbound workqueue
2013-04-01 19:08:06 -07:00
watchdog: bcm47xx_wdt.c: use platform device
2013-03-01 12:47:16 +01:00
fs/exec.c: make bprm_mm_init() static
2013-02-26 02:46:13 -05:00
Input: bma150 - make some defines public and fix some comments
2013-02-15 18:52:45 -08:00
memory-hotplug: common APIs to support page tables hot-remove
2013-02-23 17:50:12 -08:00
Btrfs: move fs/btrfs/ioctl.h to include/uapi/linux/btrfs.h
2013-02-20 09:37:28 -05:00
bug.h, compiler.h: introduce compiletime_assert & BUILD_BUG_ON_MSG
2013-02-21 17:22:16 -08:00
coda: Restrict coda messages to the initial user namespace
2013-02-13 06:00:53 -08:00
mm: compaction: make __compact_pgdat() and compact_pgdat() return void
2013-02-23 17:50:10 -08:00
fix compat truncate/ftruncate
2013-02-25 09:24:55 -05:00
compiler-gcc.h: Add gcc-recommended GCC_VERSION macro
2013-02-21 17:22:15 -08:00
compiler-gcc{3,4}.h: Use GCC_VERSION macro
2013-02-21 17:22:15 -08:00
compiler{,-gcc4}.h, bug.h: Remove duplicate macros
2013-02-21 17:22:15 -08:00
bug.h, compiler.h: introduce compiletime_assert & BUILD_BUG_ON_MSG
2013-02-21 17:22:16 -08:00
sched: add wait_for_completion_io[_timeout]
2013-02-15 16:45:06 +01:00
Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux
2013-02-25 16:46:44 -08:00
cpuidle: remove vestage definition of cpuidle_state_usage.driver_data
2013-02-11 18:49:51 -05:00
cpumask: implement cpumask_parse()
2013-03-12 11:30:04 -07:00
vfs: kill FS_REVAL_DOT by adding a d_weak_revalidate dentry op
2013-02-26 02:46:09 -05:00
Revert "lockdep: check that no locks held at freeze time"
2013-03-31 11:38:33 -07:00
dm: add target num_write_bios fn
2013-03-01 22:45:49 +00:00
driver/base: implement subsys_virtual_register()
2013-03-12 11:36:35 -07:00
dm kcopyd: introduce configurable throttling
2013-03-01 22:45:49 +00:00
dma-buf: implement vmap refcounting in the interface logic
2013-02-27 15:13:36 +05:30
dmaengine: add dma_request_slave_channel_compat()
2013-02-27 22:37:34 +05:30
dmaengine: dw_dmac: move to generic DMA binding
2013-02-28 09:53:21 +05:30
eCryptfs: allow userspace messaging to be disabled
2013-03-03 23:59:59 -08:00
EDAC: Merge mci.mem_is_per_rank with mci.csbased
2013-03-16 06:32:30 +01:00
A few fixes to reduce places where pstore might hang
2013-02-21 09:38:18 -08:00
Merge branch 'for-3.9/core' of git://git.kernel.dk/linux-block
2013-02-28 12:52:24 -08:00
default SET_PERSONALITY() in linux/elf.h
2013-02-26 02:46:08 -05:00
include/linux/eventfd.h: fix incorrect filename is a comment
2013-02-27 19:10:23 -08:00
memory-hotplug: remove /sys/firmware/memmap/X sysfs
2013-02-23 17:50:12 -08:00
Revert "lockdep: check that no locks held at freeze time"
2013-03-31 11:38:33 -07:00
fs: Limit sys_mount to only request filesystem modules.
2013-03-03 19:36:31 -08:00
userns: Don't allow creation if the user is chrooted
2013-03-27 07:49:29 -07:00
new helper: file_inode(file)
2013-02-22 23:31:31 -05:00
block: fix part_pack_uuid() build error
2013-02-26 03:10:52 +11:00
irq: Remove IRQ_EXIT_OFFSET workaround
2013-02-22 00:05:07 +01:00
kprobes: Make hash_64() as always inlined
2013-03-18 10:21:23 +01:00
hlist: drop the node parameter from iterators
2013-02-27 19:10:24 -08:00
video: Add generic HDMI infoframe helpers
2013-02-22 08:20:05 +01:00
Merge branches 'for-3.9/logitech', 'for-3.9/multitouch', 'for-3.9/ntrig', 'for-3.9/thingm' and 'for-3.9/upstream' into for-linus
2013-02-21 10:45:01 +01:00
mm: remove unused memclear_highpage_flush()
2013-02-23 17:50:16 -08:00
mm/rmap: rename anon_vma_unlock() => anon_vma_unlock_write()
2013-02-23 17:50:17 -08:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2013-02-26 20:16:07 -08:00
idr: deprecate idr_pre_get() and idr_get_new[_above]()
2013-03-13 15:21:47 -07:00
mac80211: advertise operating mode notification capability
2013-02-15 09:41:42 +01:00
macvlan: add multicast filter
2013-02-06 15:59:47 -05:00
hlist: drop the node parameter from iterators
2013-02-27 19:10:24 -08:00
vlan: adjust vlan_set_encap_proto() for its callers
2013-02-23 21:00:06 -05:00
ipv6: by default join ff01::1 and in case of forwarding ff01::2 and ff05:2
2013-02-11 14:16:26 -05:00
sched/rt: Add <linux/sched/rt.h> header to <linux/init_task.h>
2013-02-19 08:06:01 +01:00
iommu: Add DOMAIN_ATTR_WINDOWS domain attribute
2013-02-06 10:47:28 +01:00
ipmi: remove superfluous kernel/userspace explanation
2013-02-27 19:10:21 -08:00
irq_work.h: fix warning when CONFIG_IRQ_WORK=n
2013-03-22 16:41:19 -07:00
jbd2: use module parameters instead of debugfs for jbd_debug
2013-02-09 16:29:20 -05:00
printk: Provide a wake_up_klogd() off-case
2013-03-22 16:41:20 -07:00
ksm: remove old stable nodes more thoroughly
2013-02-23 17:50:19 -08:00
Revert "KVM: allow host header to be included even for !CONFIG_KVM"
2013-03-22 08:08:06 -03:00
list: Fix double fetch of pointer in hlist_entry_safe()
2013-03-14 13:18:30 -07:00
xen-blkfront: drop the use of llist_for_each_entry_safe
2013-02-19 15:17:08 -05:00
Merge branch 'core-locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2013-02-22 19:25:09 -08:00
lib/lzo: Update LZO compression to current upstream version
2013-02-20 19:36:01 +01:00
x86, ACPI, mm: Revert movablemem_map support
2013-03-02 09:34:39 -08:00
mm: refactor inactive_file_is_low() to use get_lru_size()
2013-02-23 17:50:20 -08:00
memory-hotplug: export the function try_offline_node()
2013-02-23 17:50:13 -08:00
mm: remove offlining arg to migrate_pages
2013-02-23 17:50:19 -08:00
Revert "mm: introduce VM_POPULATE flag to better deal with racy userspace programs"
2013-03-28 17:45:51 -07:00
mm: fold page->_last_nid into page->flags where possible
2013-02-23 17:50:17 -08:00
Revert "mm: introduce VM_POPULATE flag to better deal with racy userspace programs"
2013-03-28 17:45:51 -07:00
mm: zone_end_pfn is too small
2013-03-22 16:41:20 -07:00
vfs: Add a mount flag to lock read only bind mounts
2013-03-27 07:50:04 -07:00
ARM: video: mxs: Fix mxsfb misconfiguring VDCTRL0
2013-03-19 11:07:58 +08:00
v4 GRE: Add TCP segmentation offload for GRE
2013-02-15 15:17:11 -05:00
net: fix a build failure when !CONFIG_PROC_FS
2013-02-19 13:18:13 -05:00
netpoll: Fix __netpoll_rcu_free so that it can hold the rtnl lock
2013-02-11 19:19:33 -05:00
nfsd: Handle kuids and kgids in the nfs4acl to posix_acl conversion
2013-02-13 06:16:06 -08:00
nfs: Convert idmap to use kuids and kgids
2013-02-13 06:15:29 -08:00
NFS client bugfixes for Linux 3.9
2013-03-02 16:46:07 -08:00
of: Create function for counting number of phandles in a property
2013-02-13 10:09:31 +00:00
gpio: Make of_count_named_gpios() use new of_count_phandle_with_args()
2013-02-13 10:11:53 +00:00
PM / OPP: fix condition for empty of_init_opp_table()
2013-02-23 00:30:08 +01:00
mm: fold page->_last_nid into page->flags where possible
2013-02-23 17:50:17 -08:00
s390/mm: implement software dirty bits
2013-02-14 15:55:23 +01:00
mm: remove MIGRATE_ISOLATE check in hotpath
2013-02-23 17:50:15 -08:00
mm: only enforce stable page writes if the backing device requires it
2013-02-21 17:22:19 -08:00
constify path_get/path_put and fs_struct.c stuff
2013-03-01 23:51:07 -05:00
PCI changes for the v3.9 merge window:
2013-02-25 21:18:18 -08:00
Merge branch 'linux_next' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-edac
2013-02-28 20:42:33 -08:00
perf,x86: fix link failure for non-Intel configs
2013-03-17 15:59:15 -07:00
hlist: drop the node parameter from iterators
2013-02-27 19:10:24 -08:00
pm / runtime: introduce pm_runtime_set_memalloc_noio()
2013-02-23 17:50:16 -08:00
pm / runtime: introduce pm_runtime_set_memalloc_noio()
2013-02-23 17:50:16 -08:00
Driver core patches for 3.9-rc1
2013-02-21 12:05:51 -08:00
pps: Add pps_lookup_dev() function
2013-02-13 09:40:35 -08:00
printk: Provide a wake_up_klogd() off-case
2013-03-22 16:41:20 -07:00
tty/serial patches for 3.9-rc1
2013-02-21 13:41:04 -08:00
pwm: Changes for v3.9-rc1
2013-02-26 09:34:29 -08:00
spi/pxa2xx: add support for Intel Low Power Subsystem SPI
2013-02-08 13:14:40 +00:00
hlist: drop the node parameter from iterators
2013-02-27 19:10:24 -08:00
Merge remote-tracking branch 'regmap/topic/no-bus' into regmap-next
2013-02-14 17:11:09 +00:00
include/linux/res_counter.h needs errno.h
2013-03-13 15:21:44 -07:00
mm/rmap: rename anon_vma_unlock() => anon_vma_unlock_write()
2013-02-23 17:50:17 -08:00
Driver core patches for 3.9-rc1
2013-02-21 12:05:51 -08:00
lib/scatterlist: use page iterator in the mapping iterator
2013-02-27 19:10:10 -08:00
sched: replace PF_THREAD_BOUND with PF_NO_SETAFFINITY
2013-03-19 13:45:20 -07:00
seqlock: Use seqcount infrastructure
2013-02-19 08:43:34 +01:00
pps: Move timestamp read into PPS code proper
2013-02-13 10:13:58 -08:00
skb: Propagate pfmemalloc on skb from head page only
2013-03-14 11:53:32 -04:00
smp: make smp_call_function_many() use logic similar to smp_call_function_single()
2013-02-21 17:22:20 -08:00
stop_machine: Mark per cpu stopper enabled early
2013-02-26 22:25:17 +01:00
VSOCK: Introduce VM Sockets
2013-02-10 19:41:08 -05:00
srcu: Remove checks preventing idle CPUs from calling srcu_read_lock()
2013-02-07 15:15:00 -08:00
rtc: stmp3xxx: add wdt-accessor function
2013-03-01 12:40:36 +01:00
pps: Fix build breakage from decoupling pps from tty
2013-02-13 12:15:50 -08:00
PM: Introduce suspend state PM_SUSPEND_FREEZE
2013-02-09 22:30:44 +01:00
vmscan: change type of vm_total_pages to unsigned long
2013-02-23 17:50:22 -08:00
burying unused conditionals
2013-02-14 09:21:15 -05:00
tcp: adding a per-socket timestamp offset
2013-02-13 13:22:15 -05:00
thermal: shorten too long mcast group name
2013-03-20 17:56:58 -04:00
arm-soc: cleanups
2013-02-21 14:58:40 -08:00
pps: Move timestamp read into PPS code proper
2013-02-13 10:13:58 -08:00
udp: add encap_destroy callback
2013-03-20 12:10:38 -04:00
uprobes: Introduce uprobe_apply()
2013-02-08 18:28:04 +01:00
userns: Restrict when proc and sysfs can be mounted
2013-03-27 07:50:08 -07:00
mfd: vexpress: Add pseudo-GPIO based LEDs
2013-02-14 00:22:58 +01:00
virtio: Add module driver macro for virtio drivers.
2013-02-13 17:00:32 +10:30
mm: don't wait on congested zones in balance_pgdat()
2013-02-23 17:50:15 -08:00
mm: numa: handle side-effects in count_vm_numa_events() for !CONFIG_NUMA_BALANCING
2013-02-23 17:50:16 -08:00
Merge branch 'console-fixes' into drm-next
2013-02-08 12:13:43 +10:00
watchdog: core: dt: add support for the timeout-sec dt property
2013-03-01 12:48:36 +01:00
wlcore: move wl12xx_platform_data up and make it truly optional
2013-02-08 10:05:02 +02:00
workqueue: update sysfs interface to reflect NUMA awareness and a kernel param to disable NUMA affinity
2013-04-01 11:23:38 -07:00
