linux-toradex.git/include/linux/backing-dev.h, branch v6.6-rc5

writeback: remove unused delaration of bdi_async_bio_wq

2023-08-21T20:38:01+00:00

It seems it was introduced by commit d3f77dfdc718 ("blkcg: implement
REQ_CGROUP_PUNT") unintentionally, but the definition does not exist,
remove it.

Link: https://lkml.kernel.org/r/20230812110128.482650-1-xiujianfeng@huaweicloud.com
Signed-off-by: Xiu Jianfeng 
Acked-by: Tejun Heo 
Cc: Stefan Roesch 
Signed-off-by: Andrew Morton

mm: add bdi_set_min_ratio_no_scale() function

2022-11-30T23:59:06+00:00

This introduces bdi_set_min_ratio_no_scale(). It uses the max
granularity for the ratio. This function by the new sysfs knob
min_ratio_fine.

Link: https://lkml.kernel.org/r/20221119005215.3052436-19-shr@devkernel.io
Signed-off-by: Stefan Roesch 
Cc: Chris Mason 
Cc: Jens Axboe 
Signed-off-by: Andrew Morton

mm: add bdi_set_max_ratio_no_scale() function

2022-11-30T23:59:06+00:00

This introduces bdi_set_max_ratio_no_scale(). It uses the max
granularity for the ratio. This function by the new sysfs knob
max_ratio_fine.

Link: https://lkml.kernel.org/r/20221119005215.3052436-16-shr@devkernel.io
Signed-off-by: Stefan Roesch 
Cc: Chris Mason 
Cc: Jens Axboe 
Signed-off-by: Andrew Morton

mm: add bdi_set_min_bytes() function

2022-11-30T23:59:05+00:00

This introduces the bdi_set_min_bytes() function. The min_bytes function
does not store the min_bytes value. Instead it converts the min_bytes
value into the corresponding ratio value.

Link: https://lkml.kernel.org/r/20221119005215.3052436-13-shr@devkernel.io
Signed-off-by: Stefan Roesch 
Cc: Chris Mason 
Cc: Jens Axboe 
Signed-off-by: Andrew Morton

mm: add bdi_get_min_bytes() function

2022-11-30T23:59:05+00:00

This adds a function to return the specified value for min_bytes. It
converts the stored min_ratio of the bdi to the corresponding bytes
value. This is an approximation as it is based on the value that is
returned by global_dirty_limits(), which can change. The returned
value can be different than the value when the min_bytes value was set.

Link: https://lkml.kernel.org/r/20221119005215.3052436-11-shr@devkernel.io
Signed-off-by: Stefan Roesch 
Cc: Chris Mason 
Cc: Jens Axboe 
Signed-off-by: Andrew Morton

mm: add bdi_set_max_bytes() function

2022-11-30T23:59:04+00:00

This introduces the bdi_set_max_bytes() function. The max_bytes function
does not store the max_bytes value. Instead it converts the max_bytes
value into the corresponding ratio value.

Link: https://lkml.kernel.org/r/20221119005215.3052436-8-shr@devkernel.io
Signed-off-by: Stefan Roesch 
Cc: Chris Mason 
Cc: Jens Axboe 
Signed-off-by: Andrew Morton

mm: add bdi_get_max_bytes() function

2022-11-30T23:59:04+00:00

This adds a function to return the specified value for max_bytes. It
converts the stored max_ratio of the bdi to the corresponding bytes
value. It introduces the bdi_get_bytes helper function to do the
conversion. This is an approximation as it is based on the value that is
returned by global_dirty_limits(), which can change. The helper function
will also be used by the min_bytes bdi knob.

Link: https://lkml.kernel.org/r/20221119005215.3052436-6-shr@devkernel.io
Signed-off-by: Stefan Roesch 
Cc: Chris Mason 
Cc: Jens Axboe 
Signed-off-by: Andrew Morton

mm: use part per 1000000 for bdi ratios

2022-11-30T23:59:03+00:00

To get finer granularity for ratio calculations use part per million
instead of percentiles. This is especially important if we want to
automatically convert byte values to ratios. Otherwise the values that
are actually used can be quite different. This is also important for
machines with more main memory (1% of 256GB is already 2.5GB).

Link: https://lkml.kernel.org/r/20221119005215.3052436-5-shr@devkernel.io
Signed-off-by: Stefan Roesch 
Cc: Chris Mason 
Cc: Jens Axboe 
Signed-off-by: Andrew Morton

mm: add bdi_set_strict_limit() function

2022-11-30T23:59:03+00:00

Patch series "mm/block: add bdi sysfs knobs", v4.

At meta network block devices (nbd) are used to implement remote block
storage.  In testing and during production it has been observed that these
network block devices can consume a huge portion of the dirty writeback
cache and writeback can take a considerable time.

To be able to give stricter limits, I'm proposing the following changes:

1) introduce strictlimit knob

  Currently the max_ratio knob exists to limit the dirty_memory. However
  this knob only applies once (dirty_ratio + dirty_background_ratio) / 2
  has been reached.
  With the BDI_CAP_STRICTLIMIT flag, the max_ratio can be applied without
  reaching that limit. This change exposes that knob.

  This knob can also be useful for NFS, fuse filesystems and USB devices.

2) Use part of 1000000 internal calculation

  The max_ratio is based on percentage. With the current machine sizes
  percentage values can be very high (1% of a 256GB main memory is already
  2.5GB). This change uses part of 1000000 instead of percentages for the
  internal calculations.

3) Introduce two new sysfs knobs: min_bytes and max_bytes.

  Currently all calculations are based on ratio, but for a user it often
  more convenient to specify a limit in bytes. The new knobs will not
  store bytes values, instead they will translate the byte value to a
  corresponding ratio. As the internal values are now part of 1000, the
  ratio is closer to the specified value. However the value should be more
  seen as an approximation as it can fluctuate over time.


3) Introduce two new sysfs knobs: min_ratio_fine and max_ratio_fine.

  The granularity for the existing sysfs bdi knobs min_ratio and max_ratio
  is based on percentage values. The new sysfs bdi knobs min_ratio_fine
  and max_ratio_fine allow to specify the ratio as part of 1 million.


This patch (of 20):

This adds the bdi_set_strict_limit function to be able to set/unset the
BDI_CAP_STRICTLIMIT flag.

Link: https://lkml.kernel.org/r/20221119005215.3052436-1-shr@devkernel.io
Link: https://lkml.kernel.org/r/20221119005215.3052436-2-shr@devkernel.io
Signed-off-by: Stefan Roesch 
Cc: Jens Axboe 
Cc: Chris Mason 
Signed-off-by: Andrew Morton

writeback: remove inode_to_wb_is_valid()

2022-07-30T01:07:15+00:00

inode_to_wb_is_valid() is no longer used since commit fe55d563d417
("remove inode_congested()"), remove it.

Link: https://lkml.kernel.org/r/20220714084147.140324-1-xiujianfeng@huawei.com
Signed-off-by: Xiu Jianfeng 
Reviewed-by: Johannes Thumshirn 
Reviewed-by: Jan Kara 
Signed-off-by: Andrew Morton