Andrew Morton <a...@linux-foundation.org> writes:
> On Thu, 01 Sep 2016 16:04:57 -0700 "Huang\, Ying" <ying.hu...@intel.com>
> wrote:
>
>> >> }
>> >>
>> >> -#define SWAPFILE_CLUSTER 256
>> >> +#define SWAPFILE
siders
> itself to be rotational storage. It takes the paths that are optimised to
> minimise seeks but it's quite slow. When tree_lock contention is reduced,
> workload is dominated by scan_swap_map. It's a one-line fix and I have
> a patch for it but it only really matters if ramdisk is being used as a
> simulator for swapping to fast storage.
We (LKP people) use drivers/nvdimm/pmem.c instead of drivers/block/brd.c
as ramdisk. Which considers itself to be non-rotational storage.
And we have a series to optimize other locks in the swap path too, for
example batching the swap space allocating and freeing, etc. If your
solution to optimize batching removing pages from the swap cache can be
merged, that will help us much!
Best Regards,
Huang, Ying
Andrew Morton <a...@linux-foundation.org> writes:
> On Thu, 1 Sep 2016 08:16:54 -0700 "Huang, Ying" <ying.hu...@intel.com> wrote:
>
>> From: Huang Ying <ying.hu...@intel.com>
>>
>> In this patch, the size of the swap cluster is changed to
e.net/project/aimbench/aim-suite7/Initial%20release/s7110.tar.Z
>
> Thank you for the codes.
>
> I've run this workload on the latest f2fs and compared performance having
> without the reported patch. (1TB nvme SSD, 16 cores, 16GB DRAM)
> Interestingly, I could find slight performance improvement rather than
> regression. :(
> Not sure how to reproduce this.
I think the difference lies on disk used. The ramdisk is used in the
original test, but it appears that your memory is too small to setup the
RAM disk for test. So it may be impossible for you to reproduce the
test unless you can find more memory :)
But we can help you to root cause the issue. What additional data do
you want? perf-profile data before and after the patch?
Best Regards,
Huang, Ying
Hi, Rik,
Thanks for comments!
Rik van Riel <r...@redhat.com> writes:
> On Thu, 2016-08-25 at 12:27 -0700, Huang, Ying wrote:
>> File pages use a set of radix tags (DIRTY, TOWRITE, WRITEBACK, etc.)
>> to
>> accelerate finding the pages with a specific tag in the
From: Huang Ying <ying.hu...@intel.com>
File pages use a set of radix tree tags (DIRTY, TOWRITE, WRITEBACK,
etc.) to accelerate finding the pages with a specific tag in the radix
tree during inode writeback. But for anonymous pages in the swap
cache, there is no inode writebac
From: Huang Ying <ying.hu...@intel.com>
This patchset is to optimize the performance of Transparent Huge Page
(THP) swap.
Hi, Andrew, could you help me to check whether the overall design is
reasonable?
Hi, Hugh, Shaohua, Minchan and Rik, could you help me to review the
swa
From: Huang Ying <ying.hu...@intel.com>
__swapcache_free() is added to support to clear the SWAP_HAS_CACHE flag
for the huge page. This will free the specified swap cluster now.
Because now this function will be called only in the error path to free
the swap cluster just allocate
From: Huang Ying <ying.hu...@intel.com>
In this patch, the size of the swap cluster is changed to that of the
THP (Transparent Huge Page) on x86_64 architecture (512). This is for
the THP swap support on x86_64. Where one swap cluster will be used to
hold the contents of each THP swapp
From: Huang Ying <ying.hu...@intel.com>
The swap cgroup uses a kind of discontinuous array to record the
information for the swap entries. lookup_swap_cgroup() provides a good
encapsulation to access one element of the discontinuous array. To make
it easier to access multiple el
From: Huang Ying <ying.hu...@intel.com>
This patch make it possible to charge or uncharge a set of continuous
swap entries in the swap cgroup. The number of swap entries is
specified via an added parameter.
This will be used for the THP (Transparent Huge Page) swap support.
Where a swap c
From: Huang Ying <ying.hu...@intel.com>
With this patch, a THP (Transparent Huge Page) can be added/deleted
to/from the swap cache as a set of sub-pages (512 on x86_64).
This will be used for the THP (Transparent Huge Page) swap support.
Where one THP may be added/delted to/from the swap
From: Huang Ying <ying.hu...@intel.com>
Separates checking whether we can split the huge page from
split_huge_page_to_list() into a function. This will help to check that
before splitting the THP (Transparent Huge Page) really.
This will be used for delaying splitting THP during swappi
From: Huang Ying <ying.hu...@intel.com>
The swap cluster allocation/free functions are added based on the
existing swap cluster management mechanism for SSD. These functions
don't work for the rotating hard disks because the existing swap cluster
management mechanism doesn't work fo
From: Huang Ying <ying.hu...@intel.com>
This patch enhanced the split_huge_page_to_list() to work properly for
the THP (Transparent Huge Page) in the swap cache during swapping out.
This is used for delaying splitting the THP during swapping out. Where
for a THP to be swapped o
From: Huang Ying <ying.hu...@intel.com>
A variation of get_swap_page(), get_huge_swap_page(), is added to
allocate a swap cluster (512 swap slots) based on the swap cluster
allocation function. A fair simple algorithm is used, that is, only the
first swap device in priority list will be
From: Huang Ying <ying.hu...@intel.com>
__swapcache_free() is added to support to clear the SWAP_HAS_CACHE flag
for the huge page. This will free the specified swap cluster now.
Because now this function will be called only in the error path to free
the swap cluster just allocate
From: Huang Ying <ying.hu...@intel.com>
In this patch, splitting huge page is delayed from almost the first step
of swapping out to after allocating the swap space for the
THP (Transparent Huge Page) and adding the THP into the swap cache.
This will reduce lock acquiring/releasing for the
From: Huang Ying <ying.hu...@intel.com>
This patchset is to optimize the performance of Transparent Huge Page
(THP) swap.
Hi, Andrew, could you help me to check whether the overall design is
reasonable?
Hi, Hugh, Shaohua, Minchan and Rik, could you help me to review the
swa
Mel Gorman <mgor...@techsingularity.net> writes:
> On Wed, Aug 31, 2016 at 08:17:24AM -0700, Huang, Ying wrote:
>> Mel Gorman <mgor...@techsingularity.net> writes:
>>
>> > On Tue, Aug 30, 2016 at 10:28:09AM -0700, Huang, Ying wrote:
>> >> From: Hua
Mel Gorman <mgor...@techsingularity.net> writes:
> On Tue, Aug 30, 2016 at 10:28:09AM -0700, Huang, Ying wrote:
>> From: Huang Ying <ying.hu...@intel.com>
>>
>> File pages use a set of radix tree tags (DIRTY, TOWRITE, WRITEBACK,
>> etc.) to accelerat
Anshuman Khandual <khand...@linux.vnet.ibm.com> writes:
> On 09/07/2016 10:16 PM, Huang, Ying wrote:
>> From: Huang Ying <ying.hu...@intel.com>
>>
>> The swap cluster allocation/free functions are added based on the
>> existing swap cluster management mecha
"Kirill A. Shutemov" <kir...@shutemov.name> writes:
> On Wed, Sep 07, 2016 at 09:46:04AM -0700, Huang, Ying wrote:
>> From: Huang Ying <ying.hu...@intel.com>
>>
>> A variation of get_swap_page(), get_huge_swap_page(), is added to
>> allocate
Hi, Kirill,
Thanks for your comments!
"Kirill A. Shutemov" <kir...@shutemov.name> writes:
> On Wed, Sep 07, 2016 at 09:46:07AM -0700, Huang, Ying wrote:
>> From: Huang Ying <ying.hu...@intel.com>
>>
>> Separates checking whether we can split th
Hi, Anshuman,
Thanks for comments!
Anshuman Khandual <khand...@linux.vnet.ibm.com> writes:
> On 09/07/2016 10:16 PM, Huang, Ying wrote:
>> From: Huang Ying <ying.hu...@intel.com>
>>
>> With this patch, a THP (Transparent Huge Page) can be added/deleted
>>
"Kirill A. Shutemov" <kir...@shutemov.name> writes:
> On Wed, Sep 07, 2016 at 09:46:00AM -0700, Huang, Ying wrote:
>> From: Huang Ying <ying.hu...@intel.com>
>>
>> In this patch, the size of the swap cluster is changed to that of the
>> THP (T
Anshuman Khandual <khand...@linux.vnet.ibm.com> writes:
> On 09/07/2016 10:16 PM, Huang, Ying wrote:
>> From: Huang Ying <ying.hu...@intel.com>
>>
>> In this patch, the size of the swap cluster is changed to that of the
>> THP (Transparent
"Kirill A. Shutemov" <kir...@shutemov.name> writes:
> On Wed, Sep 07, 2016 at 09:46:00AM -0700, Huang, Ying wrote:
>> From: Huang Ying <ying.hu...@intel.com>
>>
>> In this patch, the size of the swap cluster is changed to that of the
>> THP (T
Anshuman Khandual <khand...@linux.vnet.ibm.com> writes:
> On 09/07/2016 10:16 PM, Huang, Ying wrote:
>> From: Huang Ying <ying.hu...@intel.com>
>>
>> This patch make it possible to charge or uncharge a set of continuous
>> swap entries in the s
gt; Agreed. I don't mind leaving it on the back burner unless Dave reports
> it really helps or a new bug report about realistic tree_lock contention
> shows up.
Best Regards,
Huang, Ying
Minchan Kim <minc...@kernel.org> writes:
> On Tue, Sep 13, 2016 at 02:40:00PM +0800, Huang, Ying wrote:
>> Minchan Kim <minc...@kernel.org> writes:
>>
>> > Hi Huang,
>> >
>> > On Fri, Sep 09, 2016 at 01:35:12PM -0700, Huang, Ying wrote:
>
Minchan Kim <minc...@kernel.org> writes:
> Hi Huang,
>
> On Fri, Sep 09, 2016 at 01:35:12PM -0700, Huang, Ying wrote:
>
> < snip >
>
>> >> Recently, the performance of the storage devices improved so fast that
>> >> we cannot saturate the dis
Hi, Minchan,
Minchan Kim <minc...@kernel.org> writes:
> Hi Huang,
>
> On Wed, Sep 07, 2016 at 09:45:59AM -0700, Huang, Ying wrote:
>> From: Huang Ying <ying.hu...@intel.com>
>>
>> This patchset is to optimize the performance of Transparent Huge Page
>
Shaohua Li <s...@kernel.org> writes:
> On Fri, Sep 23, 2016 at 10:32:39AM +0800, Huang, Ying wrote:
>> Rik van Riel <r...@redhat.com> writes:
>>
>> > On Thu, 2016-09-22 at 15:56 -0700, Shaohua Li wrote:
>> >> On Wed, Sep
Hi, Christoph,
"Huang, Ying" <ying.hu...@intel.com> writes:
> Hi, Christoph,
>
> "Huang, Ying" <ying.hu...@intel.com> writes:
>
>> Christoph Hellwig <h...@lst.de> writes:
>>
>>> Snipping the long contest:
&
Hi, Jaegeuk,
"Huang, Ying" <ying.hu...@intel.com> writes:
> Jaegeuk Kim <jaeg...@kernel.org> writes:
>
>> Hello,
>>
>> On Sat, Aug 27, 2016 at 10:13:34AM +0800, Fengguang Wu wrote:
>>> Hi Jaegeuk,
>>>
>>>
Jaegeuk Kim <jaeg...@kernel.org> writes:
> On Mon, Sep 26, 2016 at 02:26:06PM +0800, Huang, Ying wrote:
>> Hi, Jaegeuk,
>>
>> "Huang, Ying" <ying.hu...@intel.com> writes:
>>
>> > Jaegeuk Kim <jaeg...@kernel.org> writes:
>&g
be fixed that this unconvered. But
> in the end will probabkly stuck with a slight regression in this
> artificial workload.
I see. Thanks for update. Please keep me posted.
Best Regards,
Huang, Ying
Minchan Kim <minc...@kernel.org> writes:
> On Tue, Sep 13, 2016 at 04:53:49PM +0800, Huang, Ying wrote:
>> Minchan Kim <minc...@kernel.org> writes:
>> > On Tue, Sep 13, 2016 at 02:40:00PM +0800, Huang, Ying wrote:
>> >> Minchan Kim <minc..
Hi, Johannes,
Johannes Weiner <han...@cmpxchg.org> writes:
> On Thu, Sep 08, 2016 at 11:15:52AM +0530, Anshuman Khandual wrote:
>> On 09/07/2016 10:16 PM, Huang, Ying wrote:
>> > From: Huang Ying <ying.hu...@intel.com>
>> >
>> > In thi
Hi, Minchan,
Minchan Kim <minc...@kernel.org> writes:
> Hi Huang,
>
> On Sun, Sep 18, 2016 at 09:53:39AM +0800, Huang, Ying wrote:
>> Minchan Kim <minc...@kernel.org> writes:
>>
>> > On Tue, Sep 13, 2016 at 04:53:49PM +0800, Huang, Ying wrote:
>
Minchan Kim <minc...@kernel.org> writes:
> Hi Huang,
>
> On Tue, Sep 20, 2016 at 10:54:35AM +0800, Huang, Ying wrote:
>> Hi, Minchan,
>>
>> Minchan Kim <minc...@kernel.org> writes:
>> > Hi Huang,
>> >
>> > On Sun, Sep 18, 20
Rik van Riel <r...@redhat.com> writes:
> On Thu, 2016-09-22 at 15:56 -0700, Shaohua Li wrote:
>> On Wed, Sep 07, 2016 at 09:45:59AM -0700, Huang, Ying wrote:
>> >
>> > - It will help the memory fragmentation, especially when the THP is
>> > heavily us
Hi, Shaohua,
Thanks for comments!
Shaohua Li <s...@kernel.org> writes:
> On Wed, Sep 07, 2016 at 09:45:59AM -0700, Huang, Ying wrote:
>>
>> The advantages of the THP swap support include:
Sorry for confusing. This is the advantages of the final goal, that is,
avoid
From: Huang Ying <ying.hu...@intel.com>
This patch make it possible to charge or uncharge a set of continuous
swap entries in the swap cgroup. The number of swap entries is
specified via an added parameter.
This will be used for the THP (Transparent Huge Page) swap support.
Where a swap c
From: Huang Ying <ying.hu...@intel.com>
With this patch, a THP (Transparent Huge Page) can be added/deleted
to/from the swap cache as a set of sub-pages (512 on x86_64).
This will be used for the THP (Transparent Huge Page) swap support.
Where one THP may be added/delted to/from the swap
From: Huang Ying <ying.hu...@intel.com>
This patch enhanced the split_huge_page_to_list() to work properly for
the THP (Transparent Huge Page) in the swap cache during swapping out.
This is used for delaying splitting the THP during swapping out. Where
for a THP to be swapped o
From: Huang Ying <ying.hu...@intel.com>
In this patch, splitting huge page is delayed from almost the first step
of swapping out to after allocating the swap space for the
THP (Transparent Huge Page) and adding the THP into the swap cache.
This will reduce lock acquiring/releasing for the
From: Huang Ying <ying.hu...@intel.com>
Separates checking whether we can split the huge page from
split_huge_page_to_list() into a function. This will help to check that
before splitting the THP (Transparent Huge Page) really.
This will be used for delaying splitting THP during swappi
From: Huang Ying <ying.hu...@intel.com>
The swap cluster allocation/free functions are added based on the
existing swap cluster management mechanism for SSD. These functions
don't work for the rotating hard disks because the existing swap cluster
management mechanism doesn't work fo
From: Huang Ying <ying.hu...@intel.com>
A variation of get_swap_page(), get_huge_swap_page(), is added to
allocate a swap cluster (512 swap slots) based on the swap cluster
allocation function. A fair simple algorithm is used, that is, only the
first swap device in priority list will be
From: Huang Ying <ying.hu...@intel.com>
In this patch, the size of the swap cluster is changed to that of the
THP (Transparent Huge Page) on x86_64 architecture (512). This is for
the THP swap support on x86_64. Where one swap cluster will be used to
hold the contents of each THP swapp
From: Huang Ying <ying.hu...@intel.com>
The swap cgroup uses a kind of discontinuous array to record the
information for the swap entries. lookup_swap_cgroup() provides a good
encapsulation to access one element of the discontinuous array. To make
it easier to access multiple el
From: Huang Ying <ying.hu...@intel.com>
This patch is to improve the performance of swap cache operations when
the type of the swap device is not 0. Originally, the whole swap entry
value is used as the key of the swap cache, even though there is one
radix tree for each swap device. If th
From: Huang Ying <ying.hu...@intel.com>
After using the offset of the swap entry as the key of the swap cache,
the page_index() becomes exactly same as page_file_index(). So the
page_file_index() is removed and the callers are changed to use
page_index() instead.
Cc: Trond Myk
Borislav Petkov <b...@suse.de> writes:
> On Wed, Aug 17, 2016 at 03:29:04PM -0700, Huang, Ying wrote:
>> branch-miss-rate decreased from ~0.30% to ~0.043%.
>>
>> So I guess there are some code alignment change, which caused decreased
>> branch miss rate.
&g
gt; On Mon, Aug 22, 2016 at 02:33:08PM -0700, Huang, Ying wrote:
>> Hi, Minchan,
>>
>> Minchan Kim <minc...@kernel.org> writes:
>> > Anyway, I hope [1/11] should be merged regardless of the patchset because
>> > I believe anyone doesn't feel comfortable with cl
for it?
Best Regards,
Huang, Ying
Hi, Peter,
Do you have a git tree branch for this patchset? We want to test it in
0day performance test. That will make it a little easier.
Best Regards,
Huang, Ying
mgor...@techsingularity.net>
Cc: Tejun Heo <t...@kernel.org>
Cc: Wu Fengguang <fengguang...@intel.com>
Cc: Dave Hansen <dave.han...@intel.com>
Signed-off-by: "Huang, Ying" <ying.hu...@intel.com>
---
mm/page-writeback.c | 6 --
1 file changed, 4 insertion
ap write test case for a ramdisk on a Xeon E5 v3 machine,
the swap out throughput improved 40.4%, from ~0.97GB/s to ~1.36GB/s.
What's your plan for this patch? If it can be merged soon, that will be
great!
I found some issues in the original patch to work with swap cache. Below
is my fixes to make
"Huang, Ying" <ying.hu...@intel.com> writes:
> Hi, Dave,
>
> Dave Hansen <dave.han...@intel.com> writes:
>
>> On 08/09/2016 09:17 AM, Huang, Ying wrote:
>>> File pages uses a set of radix tags (DIRTY, TOWRITE, WRITEBACK) to
>>> accelerat
Hi, Jaegeuk,
On Thu, Aug 11, 2016 at 6:22 PM, Jaegeuk Kim <jaeg...@kernel.org> wrote:
> On Thu, Aug 11, 2016 at 03:49:41PM -0700, Huang, Ying wrote:
>> Hi, Kim,
>>
>> "Huang, Ying" <ying.hu...@intel.com> writes:
>> >>
>> >> [lkp
From: Huang Ying <ying.hu...@intel.com>
This is a code clean up patch without functionality changes. The
swap_cluster_list data structure and its operations are introduced to
provide some better encapsulation for the free cluster and discard
cluster list operations. This avoid som
From: Huang Ying <ying.hu...@intel.com>
This patchset is to optimize the performance of Transparent Huge Page
(THP) swap.
Hi, Andrew, could you help me to check whether the overall design is
reasonable?
Hi, Hugh, Shaohua, Minchan and Rik, could you help me to review the
swa
From: Huang Ying <ying.hu...@intel.com>
This patch make it possible to charge or uncharge a set of continuous
swap entries in the swap cgroup. The number of swap entries is
specified via an added parameter.
This will be used for the THP (Transparent Huge Page) swap support.
Where a swap c
From: Huang Ying <ying.hu...@intel.com>
This patch enhanced the split_huge_page_to_list() to work properly for
the THP (Transparent Huge Page) in the swap cache during swapping out.
This is used for delaying splitting the THP during swapping out. Where
for a THP to be swapped o
From: Huang Ying <ying.hu...@intel.com>
Johannes suggested me to use two big patches instead 9 patches. And he
feels that is easier for him to review. I am not sure whether this is
desirable for other reviewers too. So I sent out both versions for
review. If this version is pref
From: Huang Ying <ying.hu...@intel.com>
With this patch, a THP (Transparent Huge Page) can be added/deleted
to/from the swap cache as a set of (HPAGE_PMD_NR) sub-pages.
This will be used for the THP (Transparent Huge Page) swap support.
Where one THP may be added/delted to/from the swap
From: Huang Ying <ying.hu...@intel.com>
The swap cluster allocation/free functions are added based on the
existing swap cluster management mechanism for SSD. These functions
don't work for the rotating hard disks because the existing swap cluster
management mechanism doesn't work fo
From: Huang Ying <ying.hu...@intel.com>
In this patch, the size of the swap cluster is changed to that of the
THP (Transparent Huge Page) on x86_64 architecture (512). This is for
the THP swap support on x86_64. Where one swap cluster will be used to
hold the contents of each THP swapp
From: Huang Ying <ying.hu...@intel.com>
A variation of get_swap_page(), get_huge_swap_page(), is added to
allocate a swap cluster (HPAGE_PMD_NR swap slots) based on the swap
cluster allocation function. A fair simple algorithm is used, that is,
only the first swap device in priorit
From: Huang Ying <ying.hu...@intel.com>
__swapcache_free() is added to support to clear the SWAP_HAS_CACHE flag
for the huge page. This will free the specified swap cluster now.
Because now this function will be called only in the error path to free
the swap cluster just allocate
From: Huang Ying <ying.hu...@intel.com>
In this patch, splitting huge page is delayed from almost the first step
of swapping out to after allocating the swap space for the
THP (Transparent Huge Page) and adding the THP into the swap cache.
This will reduce lock acquiring/releasing for the
From: Huang Ying <ying.hu...@intel.com>
Separates checking whether we can split the huge page from
split_huge_page_to_list() into a function. This will help to check that
before splitting the THP (Transparent Huge Page) really.
This will be used for delaying splitting THP during swappi
goto new_cluster;
>> +}
>> +ci = lock_cluster(si, tmp);
>> +while (tmp < max) {
>
> In this work tmp is checked to be less than the max value.
> Semantic change hoped?
Oops! tmp should be checked to be more than the min value. Will fix it
in
n't I still find that? These reports suck!
There is observable changes between the benchmark (will-it-scale)
scores. That is said in the subject of the mail: "[No primary
change]". But apparently, that is not clear. We will improve that to
make it more clear.
> The result doesn't make sense, my gcc inlines the function call, the
> emitted code is very similar to the old code, with exception of one
> extra symbol.
>
> Are you sure this isn't simple run to run variation?
The reported change is perf-stat.branch-miss-rate%, which is changed
from 0.19% to 0.21%. That is too small. So, please ignore this
report. We will be more careful in the future.
Best Regards,
Huang, Ying
Hi, Jonathan,
Thanks for review.
Jonathan Corbet <cor...@lwn.net> writes:
> On Thu, 20 Oct 2016 16:31:41 -0700
> Tim Chen <tim.c.c...@linux.intel.com> wrote:
>
>> From: "Huang, Ying" <ying.hu...@intel.com>
>>
>> This patch is to reduce the
"Kirill A. Shutemov" <kir...@shutemov.name> writes:
> On Wed, Nov 16, 2016 at 11:10:48AM +0800, Huang, Ying wrote:
>> From: Huang Ying <ying.hu...@intel.com>
>>
>> This patchset is to optimize the performance of Transparent Huge Page
>> (THP) sw
robably puts gunk in sysfs that we don't need.
Although other error sources are not platform devices, I think it is
generally good to make GHES platform devices. To take advantage of
automatic module loading, we can make ghes a module again, but prevent
it from unloading. What do you think about that?
Best Regards,
Huang, Ying
From: Huang Ying <ying.hu...@intel.com>
This patch make it possible to charge or uncharge a set of continuous
swap entries in the swap cgroup. The number of swap entries is
specified via an added parameter.
This will be used for the THP (Transparent Huge Page) swap support.
Where a swap c
From: Huang Ying <ying.hu...@intel.com>
In this patch, splitting huge page is delayed from almost the first step
of swapping out to after allocating the swap space for the
THP (Transparent Huge Page) and adding the THP into the swap cache.
This will reduce lock acquiring/releasing for the
From: Huang Ying <ying.hu...@intel.com>
Separates checking whether we can split the huge page from
split_huge_page_to_list() into a function. This will help to check that
before splitting the THP (Transparent Huge Page) really.
This will be used for delaying splitting THP during swappi
From: Huang Ying <ying.hu...@intel.com>
With this patch, a THP (Transparent Huge Page) can be added/deleted
to/from the swap cache as a set of (HPAGE_PMD_NR) sub-pages.
This will be used for the THP (Transparent Huge Page) swap support.
Where one THP may be added/delted to/from the swap
From: Huang Ying <ying.hu...@intel.com>
In this patch, the size of the swap cluster is changed to that of the
THP (Transparent Huge Page) on x86_64 architecture (512). This is for
the THP swap support on x86_64. Where one swap cluster will be used to
hold the contents of each THP swapp
From: Huang Ying <ying.hu...@intel.com>
This patchset is to optimize the performance of Transparent Huge Page
(THP) swap.
Hi, Andrew, could you help me to check whether the overall design is
reasonable?
Hi, Hugh, Shaohua, Minchan and Rik, could you help me to review the
swa
From: Huang Ying <ying.hu...@intel.com>
A variation of get_swap_page(), get_huge_swap_page(), is added to
allocate a swap cluster (HPAGE_PMD_NR swap slots) based on the swap
cluster allocation function. A fair simple algorithm is used, that is,
only the first swap device in priorit
From: Huang Ying <ying.hu...@intel.com>
This patch enhanced the split_huge_page_to_list() to work properly for
the THP (Transparent Huge Page) in the swap cache during swapping out.
This is used for delaying splitting the THP during swapping out. Where
for a THP to be swapped o
From: Huang Ying <ying.hu...@intel.com>
The swap cluster allocation/free functions are added based on the
existing swap cluster management mechanism for SSD. These functions
don't work for the rotating hard disks because the existing swap cluster
management mechanism doesn't work fo
From: Huang Ying <ying.hu...@intel.com>
__swapcache_free() is added to support to clear the SWAP_HAS_CACHE flag
for the huge page. This will free the specified swap cluster now.
Because now this function will be called only in the error path to free
the swap cluster just allocate
Hillf Danton <hillf...@alibaba-inc.com> writes:
> On Friday, October 28, 2016 1:56 PM Huang, Ying wrote:
>> @@ -2016,10 +2021,12 @@ int page_trans_huge_mapcount(struct page *page, int
>> *total_mapcount)
>> /* Racy check whether the huge page can be split */
>>
From: Huang Ying <ying.hu...@intel.com>
The swap cluster allocation/free functions are added based on the
existing swap cluster management mechanism for SSD. These functions
don't work for the rotating hard disks because the existing swap cluster
management mechanism doesn't work fo
From: Huang Ying <ying.hu...@intel.com>
This patch enhanced the split_huge_page_to_list() to work properly for
the THP (Transparent Huge Page) in the swap cache during swapping out.
This is used for delaying splitting the THP during swapping out. Where
for a THP to be swapped o
From: Huang Ying <ying.hu...@intel.com>
__swapcache_free() is added to support to clear the SWAP_HAS_CACHE flag
for the huge page. This will free the specified swap cluster now.
Because now this function will be called only in the error path to free
the swap cluster just allocate
From: Huang Ying <ying.hu...@intel.com>
In this patch, the size of the swap cluster is changed to that of the
THP (Transparent Huge Page) on x86_64 architecture (512). This is for
the THP swap support on x86_64. Where one swap cluster will be used to
hold the contents of each THP swapp
From: Huang Ying <ying.hu...@intel.com>
This patch make it possible to charge or uncharge a set of continuous
swap entries in the swap cgroup. The number of swap entries is
specified via an added parameter.
This will be used for the THP (Transparent Huge Page) swap support.
Where a swap c
From: Huang Ying <ying.hu...@intel.com>
This patchset is to optimize the performance of Transparent Huge Page
(THP) swap.
Hi, Andrew, could you help me to check whether the overall design is
reasonable?
Hi, Hugh, Shaohua, Minchan and Rik, could you help me to review the
swa
From: Huang Ying <ying.hu...@intel.com>
In this patch, splitting huge page is delayed from almost the first step
of swapping out to after allocating the swap space for the
THP (Transparent Huge Page) and adding the THP into the swap cache.
This will reduce lock acquiring/releasing for the
From: Huang Ying <ying.hu...@intel.com>
A variation of get_swap_page(), get_huge_swap_page(), is added to
allocate a swap cluster (HPAGE_PMD_NR swap slots) based on the swap
cluster allocation function. A fair simple algorithm is used, that is,
only the first swap device in priorit
From: Huang Ying <ying.hu...@intel.com>
Separates checking whether we can split the huge page from
split_huge_page_to_list() into a function. This will help to check that
before splitting the THP (Transparent Huge Page) really.
This will be used for delaying splitting THP during swappi
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