diff options
author | Dennis Zhou (Facebook) <dennisszhou@gmail.com> | 2017-07-25 01:02:05 +0200 |
---|---|---|
committer | Tejun Heo <tj@kernel.org> | 2017-07-26 16:23:52 +0200 |
commit | c0ebfdc3fefdef73131c7cb431ad8079f65c714a (patch) | |
tree | fa6ace66fe686920fca8a437210fe64863783f69 /mm/percpu-internal.h | |
parent | percpu: setup_first_chunk rename schunk/dchunk to chunk (diff) | |
download | linux-c0ebfdc3fefdef73131c7cb431ad8079f65c714a.tar.xz linux-c0ebfdc3fefdef73131c7cb431ad8079f65c714a.zip |
percpu: modify base_addr to be region specific
Originally, the first chunk was served by one or two chunks, each
given a region they are responsible for. Despite this, the arithmetic
was based off of the true base_addr of the chunk making it be overly
inclusive.
This patch moves the base_addr of chunks that are responsible for the
first chunk. The base_addr must remain page aligned to keep the
address alignment correct, so it is the beginning of the region served
page aligned down. start_offset holds where the region served begins
from this new base_addr.
The corresponding percpu address checks are modified to be more specific
as a result. The first chunk considers only the dynamic region and both
first chunk and reserved chunk checks ignore the static region. The
static region addresses should never be passed into the allocator. There
is no impact here besides distinguishing the first chunk and making the
checks specific.
The percpu pointer to physical address is left intact as addresses are
not given out in the non-allocated portion of percpu memory.
nr_pages is added to pcpu_chunk to keep track of the size of the entire
region served containing both start_offset and end_offset. This variable
will be used to manage the bitmap allocator.
Signed-off-by: Dennis Zhou <dennisszhou@gmail.com>
Reviewed-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'mm/percpu-internal.h')
-rw-r--r-- | mm/percpu-internal.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/mm/percpu-internal.h b/mm/percpu-internal.h index f02f31cea0e6..34cb9799e324 100644 --- a/mm/percpu-internal.h +++ b/mm/percpu-internal.h @@ -29,6 +29,8 @@ struct pcpu_chunk { int end_offset; /* additional area required to have the region end page aligned */ + + int nr_pages; /* # of pages served by this chunk */ int nr_populated; /* # of populated pages */ unsigned long populated[]; /* populated bitmap */ }; |