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  1. 06 3月, 2009 7 次提交
    • T
      percpu, module: implement reserved allocation and use it for module percpu variables · edcb4639
      由 Tejun Heo 提交于 
      Impact: add reserved allocation functionality and use it for module
	percpu variables

This patch implements reserved allocation from the first chunk.  When
setting up the first chunk, arch can ask to set aside certain number
of bytes right after the core static area which is available only
through a separate reserved allocator.  This will be used primarily
for module static percpu variables on architectures with limited
relocation range to ensure that the module perpcu symbols are inside
the relocatable range.

If reserved area is requested, the first chunk becomes reserved and
isn't available for regular allocation.  If the first chunk also
includes piggy-back dynamic allocation area, a separate chunk mapping
the same region is created to serve dynamic allocation.  The first one
is called static first chunk and the second dynamic first chunk.
Although they share the page map, their different area map
initializations guarantee they serve disjoint areas according to their
purposes.

If arch doesn't setup reserved area, reserved allocation is handled
like any other allocation.
Signed-off-by: NTejun Heo <tj@kernel.org>
      edcb4639
    • T
      percpu: add an indirection ptr for chunk page map access · 3e24aa58
      由 Tejun Heo 提交于 
      Impact: allow sharing page map, no functional difference yet

Make chunk->page access indirect by adding a pointer and renaming the
actual array to page_ar.  This will be used by future changes.
Signed-off-by: NTejun Heo <tj@kernel.org>
      3e24aa58
    • T
      x86: make embedding percpu allocator return excessive free space · 9a4f8a87
      由 Tejun Heo 提交于 
      Impact: reduce unnecessary memory usage on certain configurations

Embedding percpu allocator allocates unit_size *
smp_num_possible_cpus() bytes consecutively and use it for the first
chunk.  However, if the static area is small, this can result in
excessive prellocated free space in the first chunk due to
PCPU_MIN_UNIT_SIZE restriction.

This patch makes embedding percpu allocator preallocate only what's
necessary as described by PERPCU_DYNAMIC_RESERVE and return the
leftover to the bootmem allocator.
Signed-off-by: NTejun Heo <tj@kernel.org>
      9a4f8a87
    • T
      percpu: use negative for auto for pcpu_setup_first_chunk() arguments · cafe8816
      由 Tejun Heo 提交于 
      Impact: argument semantic cleanup

In pcpu_setup_first_chunk(), zero @unit_size and @dyn_size meant
auto-sizing.  It's okay for @unit_size as 0 doesn't make sense but 0
dynamic reserve size is valid.  Alos, if arch @dyn_size is calculated
from other parameters, it might end up passing in 0 @dyn_size and
malfunction when the size is automatically adjusted.

This patch makes both @unit_size and @dyn_size ssize_t and use -1 for
auto sizing.
Signed-off-by: NTejun Heo <tj@kernel.org>
      cafe8816
    • T
      percpu: improve first chunk initial area map handling · 61ace7fa
      由 Tejun Heo 提交于 
      Impact: no functional change

When the first chunk is created, its initial area map is not allocated
because kmalloc isn't online yet.  The map is allocated and
initialized on the first allocation request on the chunk.  This works
fine but the scattering of initialization logic between the init
function and allocation path is a bit confusing.

This patch makes the first chunk initialize and use minimal statically
allocated map from pcpu_setpu_first_chunk().  The map resizing path
still needs to handle this specially but it's more straight-forward
and gives more latitude to the init path.  This will ease future
changes.
Signed-off-by: NTejun Heo <tj@kernel.org>
      61ace7fa
    • T
      percpu: cosmetic renames in pcpu_setup_first_chunk() · 2441d15c
      由 Tejun Heo 提交于 
      Impact: cosmetic, preparation for future changes

Make the following renames in pcpur_setup_first_chunk() in preparation
for future changes.

* s/free_size/dyn_size/
* s/static_vm/first_vm/
* s/static_chunk/schunk/
Signed-off-by: NTejun Heo <tj@kernel.org>
      2441d15c
    • T
      percpu: clean up percpu constants · 6a242909
      由 Tejun Heo 提交于 
      Impact: cleaup

Make the following cleanups.

* There isn't much arch-specific about PERCPU_MODULE_RESERVE.  Always
  define it whether arch overrides PERCPU_ENOUGH_ROOM or not.

* blackfin overrides PERCPU_ENOUGH_ROOM to align static area size.  Do
  it by default.

* percpu allocation sizes doesn't have much to do with the page size.
  Don't use PAGE_SHIFT in their definition.
Signed-off-by: NTejun Heo <tj@kernel.org>
Cc: Bryan Wu <cooloney@kernel.org>
      6a242909
  3. 04 3月, 2009 4 次提交
  5. 03 3月, 2009 29 次提交