05 Jun, 2014
1 commit
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[akpm@linux-foundation.org: don't overwrite kstrtoull()'s errno]
Signed-off-by: Fabian Frederick
Cc: Michal Hocko
Cc: Tejun Heo
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
08 Apr, 2014
1 commit
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The res_counter_{charge,uncharge}_locked() variants are not used in the
kernel outside of the resource counter code itself, so remove the
interface.Signed-off-by: David Rientjes
Acked-by: Michal Hocko
Cc: Johannes Weiner
Cc: KAMEZAWA Hiroyuki
Cc: Christoph Lameter
Cc: Pekka Enberg
Cc: Tejun Heo
Cc: Mel Gorman
Cc: Oleg Nesterov
Cc: Rik van Riel
Cc: Jianguo Wu
Cc: Tim Hockin
Cc: Christoph Lameter
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
13 Sep, 2013
3 commits
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This function dereferences res far too often, so optimize it.
Signed-off-by: Sha Zhengju
Signed-off-by: Qiang Huang
Acked-by: Michal Hocko
Cc: Daisuke Nishimura
Cc: Jeff Liu
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Since PAGE_ALIGN is aligning up(the next page boundary), so after
PAGE_ALIGN, the value might be overflow, such as write the MAX value to
*.limit_in_bytes.$ cat /cgroup/memory/memory.limit_in_bytes
18446744073709551615# echo 18446744073709551615 > /cgroup/memory/memory.limit_in_bytes
bash: echo: write error: Invalid argumentSome user programs might depend on such behaviours(like libcg, we read
the value in snapshot, then use the value to reset cgroup later), and
that will cause confusion. So we need to fix it.Signed-off-by: Sha Zhengju
Signed-off-by: Qiang Huang
Acked-by: Michal Hocko
Cc: Daisuke Nishimura
Cc: Jeff Liu
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
RESOURCE_MAX is far too general name, change it to RES_COUNTER_MAX.
Signed-off-by: Sha Zhengju
Signed-off-by: Qiang Huang
Acked-by: Michal Hocko
Cc: Daisuke Nishimura
Cc: Jeff Liu
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
19 Dec, 2012
1 commit
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It is useful to know how many charges are still left after a call to
res_counter_uncharge. While it is possible to issue a res_counter_read
after uncharge, this can be racy.If we need, for instance, to take some action when the counters drop down
to 0, only one of the callers should see it. This is the same semantics
as the atomic variables in the kernel.Since the current return value is void, we don't need to worry about
anything breaking due to this change: nobody relied on that, and only
users appearing from now on will be checking this value.Signed-off-by: Glauber Costa
Reviewed-by: Michal Hocko
Acked-by: Kamezawa Hiroyuki
Acked-by: David Rientjes
Cc: Johannes Weiner
Cc: Suleiman Souhlal
Cc: Tejun Heo
Cc: Christoph Lameter
Cc: Frederic Weisbecker
Cc: Greg Thelen
Cc: JoonSoo Kim
Cc: Mel Gorman
Cc: Pekka Enberg
Cc: Rik van Riel
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
13 Dec, 2012
1 commit
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Since commit 628f42355389 ("memcg: limit change shrink usage") both
res_counter_write() and write_strategy_fn have been unused. This patch
deletes them both.Signed-off-by: Greg Thelen
Cc: Glauber Costa
Cc: Tejun Heo
Acked-by: KAMEZAWA Hiroyuki
Cc: Frederic Weisbecker
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
30 May, 2012
1 commit
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When killing a res_counter which is a child of other counter, we need to
dores_counter_uncharge(child, xxx)
res_counter_charge(parent, xxx)This is not atomic and wastes CPU. This patch adds
res_counter_uncharge_until(). This function's uncharge propagates to
ancestors until specified res_counter.res_counter_uncharge_until(child, parent, xxx)
Now the operation is atomic and efficient.
Signed-off-by: Frederic Weisbecker
Signed-off-by: KAMEZAWA Hiroyuki
Cc: Aneesh Kumar K.V
Cc: Michal Hocko
Cc: Johannes Weiner
Cc: Ying Han
Cc: Glauber Costa
Reviewed-by: Tejun Heo
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
28 Apr, 2012
2 commits
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Updating max_usage is something one would expect when we reach
a new maximum usage value even when we do this by forcing through
the limit with res_counter_charge_nofail().(Whether we want to account failcnt when we force through the limit
is another debate).Signed-off-by: Frederic Weisbecker
Signed-off-by: Tejun Heo
Acked-by: KAMEZAWA Hiroyuki
Acked-by: Glauber Costa
Acked-by: Kirill A. Shutemov
Cc: Li Zefan -
These two functions do almost the same thing and duplicate some code.
Merge their implementation into a single common function.
res_counter_charge_locked() takes one more parameter but it doesn't seem
to be used outside res_counter.c yet anyway.There is no (intended) change in the behaviour.
Signed-off-by: Frederic Weisbecker
Signed-off-by: Tejun Heo
Acked-by: KAMEZAWA Hiroyuki
Acked-by: Glauber Costa
Acked-by: Kirill A. Shutemov
Cc: Li Zefan
23 Jan, 2012
1 commit
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There is a case in __sk_mem_schedule(), where an allocation
is beyond the maximum, but yet we are allowed to proceed.
It happens under the following condition:sk->sk_wmem_queued + size >= sk->sk_sndbuf
The network code won't revert the allocation in this case,
meaning that at some point later it'll try to do it. Since
this is never communicated to the underlying res_counter
code, there is an inbalance in res_counter uncharge operation.I see two ways of fixing this:
1) storing the information about those allocations somewhere
in memcg, and then deducting from that first, before
we start draining the res_counter,
2) providing a slightly different allocation function for
the res_counter, that matches the original behavior of
the network code more closely.I decided to go for #2 here, believing it to be more elegant,
since #1 would require us to do basically that, but in a more
obscure way.Signed-off-by: Glauber Costa
Cc: KAMEZAWA Hiroyuki
Cc: Johannes Weiner
Cc: Michal Hocko
CC: Tejun Heo
CC: Li Zefan
CC: Laurent Chavey
Acked-by: Tejun Heo
Signed-off-by: David S. Miller
13 Dec, 2011
1 commit
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The memparse() function already accepts const char * as the parsing string.
Signed-off-by: Davidlohr Bueso
Acked-by: Pavel Emelyanov
Signed-off-by: Tejun Heo
24 Mar, 2011
1 commit
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res_counter_read_u64 reads u64 value without lock. It's dangerous in a
32bit environment. Add locking.Signed-off-by: KAMEZAWA Hiroyuki
Cc: Greg Thelen
Cc: Johannes Weiner
Cc: David Rientjes
Cc: KOSAKI Motohiro
Cc: Minchan Kim
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
30 Mar, 2010
1 commit
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…it slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files. percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.percpu.h -> slab.h dependency is about to be removed. Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability. As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.http://userweb.kernel.org/~tj/misc/slabh-sweep.py
The script does the followings.
* Scan files for gfp and slab usages and update includes such that
only the necessary includes are there. ie. if only gfp is used,
gfp.h, if slab is used, slab.h.* When the script inserts a new include, it looks at the include
blocks and try to put the new include such that its order conforms
to its surrounding. It's put in the include block which contains
core kernel includes, in the same order that the rest are ordered -
alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
doesn't seem to be any matching order.* If the script can't find a place to put a new include (mostly
because the file doesn't have fitting include block), it prints out
an error message indicating which .h file needs to be added to the
file.The conversion was done in the following steps.
1. The initial automatic conversion of all .c files updated slightly
over 4000 files, deleting around 700 includes and adding ~480 gfp.h
and ~3000 slab.h inclusions. The script emitted errors for ~400
files.2. Each error was manually checked. Some didn't need the inclusion,
some needed manual addition while adding it to implementation .h or
embedding .c file was more appropriate for others. This step added
inclusions to around 150 files.3. The script was run again and the output was compared to the edits
from #2 to make sure no file was left behind.4. Several build tests were done and a couple of problems were fixed.
e.g. lib/decompress_*.c used malloc/free() wrappers around slab
APIs requiring slab.h to be added manually.5. The script was run on all .h files but without automatically
editing them as sprinkling gfp.h and slab.h inclusions around .h
files could easily lead to inclusion dependency hell. Most gfp.h
inclusion directives were ignored as stuff from gfp.h was usually
wildly available and often used in preprocessor macros. Each
slab.h inclusion directive was examined and added manually as
necessary.6. percpu.h was updated not to include slab.h.
7. Build test were done on the following configurations and failures
were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my
distributed build env didn't work with gcov compiles) and a few
more options had to be turned off depending on archs to make things
build (like ipr on powerpc/64 which failed due to missing writeq).* x86 and x86_64 UP and SMP allmodconfig and a custom test config.
* powerpc and powerpc64 SMP allmodconfig
* sparc and sparc64 SMP allmodconfig
* ia64 SMP allmodconfig
* s390 SMP allmodconfig
* alpha SMP allmodconfig
* um on x86_64 SMP allmodconfig8. percpu.h modifications were reverted so that it could be applied as
a separate patch and serve as bisection point.Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
