[CRIU] [PATCH v2 0/4] aio: Support two versions of io_setup()

[Kirill Tkhai]

On 20.05.2016 12:46, Pavel Emelyanov wrote:
> On 05/19/2016 04:11 PM, Kirill Tkhai wrote:
>> Since e1bdd5f27a5b "aio: percpu reqs_available" kernel's io_setup()
>> behaviour has changed. The syscall become multiply passed nr_events
>> parameter twice to get on well with per-cpu aio.
> 
> git describe says that the commit in question is 3.11-rc1++. Even if
> we compensate for the errors git-describe might have due to merge
> commits, in 3.11 aio was calculated in a new manner. But criu works
> with aio only since 3.19, when it's become possible to remap rings.
> 
> So why do we care for two versions?

Remap is backported to Virtuozzo 7 and RHEL7, just because of this. But if so,
we'll backport e1bdd5f27a5b to Virtuozzo and recommend RHEL people
to do the same.

>> CRIU supports only the e1bdd5f27a5b commit's logic, but it fails
>> on older kernels. This patchset aims to support older logic too.
>>
>> v2: Take number of possible cpus in account
>> ---
>>
>> Kirill Tkhai (4):
>>       kdat: Calculate number of possible cpus
>>       aio: Change pair of debug messages
>>       aio: Refactor nr_req calculation
>>       aio: Support two versions of io_setup()
>>
>>
>>  criu/aio.c              |  112 ++++++++++++++++++++++++++++++++++++++++-------
>>  criu/cr-restore.c       |    9 +++-
>>  criu/include/aio.h      |    2 +
>>  criu/include/kerndat.h  |    1 
>>  criu/include/parasite.h |    2 -
>>  criu/include/vma.h      |    1 
>>  criu/kerndat.c          |   76 ++++++++++++++++++++++++++++++++
>>  criu/pie/parasite.c     |    2 -
>>  criu/pie/restorer.c     |    7 ++-
>>  criu/proc_parse.c       |    1 
>>  10 files changed, 187 insertions(+), 26 deletions(-)
>>
>> --
>> Signed-by: Kirill Tkhai <ktkhai at virtuozzo.com>
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>>
>