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
Hi, Hillf,
Hillf Danton <hillf...@alibaba-inc.com> writes:
> On Friday, October 28, 2016 1:56 PM Huang, Ying wrote:
>>
>> @@ -109,9 +118,16 @@ int __add_to_swap_cache(struct page *page, swp_entry_t
>> entry)
>> * So add_to_swa
Hi, Kim,
Jaegeuk Kim <jaeg...@kernel.org> writes:
> On Tue, Sep 27, 2016 at 08:50:02AM +0800, Huang, Ying wrote:
>> Jaegeuk Kim <jaeg...@kernel.org> writes:
>>
>> > On Mon, Sep 26, 2016 at 02:26:06PM +0800, Huang, Ying wrote:
>> >> Hi, Jaegeuk,
stics builtin, although it is an OS
noise benchmark. ftq.noise.50% is calculated as below:
There is a score for every sample of ftq. The lower the score, the
higher the noises. ftq.noise.50% is the number (per 100 samples) of
samples whose score is less than 50% of the mean score.
Best Regards
name: Intel Corporation LH
>> Pass/S4600LH, BIOS SE5C600.86B.99.02.1047.032320122259 03/23/2012
>> kern :warn : [ 325.608922] c9002c1f7be0
>> kern :warn : [ 325.608923] 81466af9
>> kern :warn : [ 325.608924] 880fea2425c0
>
> I think this is actually a bug introduced by Ross' PMD support. Attached
> patch should fix it. Ross, can you check it please?
Hi, Jan
Could you provide a git tree commit for me to test it? If you want it
to be tested by 0day.
Best Regards,
Huang, Ying
> Honza
misread some text in the original log.
Best Regards,
Huang, Ying
Jan Kara <j...@suse.cz> writes:
> On Tue 13-12-16 09:27:51, Huang, Ying wrote:
>> Jan Kara <j...@suse.cz> writes:
>>
>> > On Mon 12-12-16 18:13:21, kernel test robot wrote:
>> >> FYI, we noticed the following commit:
>> >>
>> &
Joel Fernandes <joe...@google.com> writes:
> llist.h comments are a bit confusing about when locking is needed versus when
> it isn't. Clarify these comments a bit more by being a bit more descriptive
> about why locking is needed for llist_del_first.
>
> Cc: Huang Ying
Joel Fernandes <joe...@google.com> writes:
> Usage llist_del_first needs lock protection, however the table in the
> comments of llist.h show a '-'. Correct this, and also add better
> comments on top.
>
> Cc: Huang Ying <ying.hu...@intel.com>
> Cc: Ingo
Joel Fernandes <joe...@google.com> writes:
> On Thu, Dec 8, 2016 at 6:12 PM, Huang, Ying <ying.hu...@intel.com> wrote:
>> Joel Fernandes <joe...@google.com> writes:
>>
>>> On Thu, Dec 8, 2016 at 4:42 PM, Joel Fernandes <joe...@google.com> wrote:
Joel Fernandes <joe...@google.com> writes:
> On Thu, Dec 8, 2016 at 4:42 PM, Joel Fernandes <joe...@google.com> wrote:
>> On Thu, Dec 8, 2016 at 4:35 PM, Huang, Ying <ying.hu...@intel.com> wrote:
>>> Joel Fernandes <joe...@google.com> writes:
>>&g
Andrew Morton <a...@linux-foundation.org> writes:
> On Thu, 12 Jan 2017 09:47:51 +0800 "Huang\, Ying" <ying.hu...@intel.com>
> wrote:
>
>> >> > 1MB swap space, so for 1TB swap space, the total size will be 80M
>> >> > compared with 8M
s, which sequentially allocate and write
to the anonymous pages until the RAM and part of the swap device is
used.
Signed-off-by: "Huang, Ying" <ying.hu...@intel.com>
---
include/linux/swap.h | 6 ++
mm/swapfile.c| 211 +--
2
m, have you received it, copied below,
From: huang ying <huang.ying.cari...@gmail.com>
Subject: Re: [PATCH v2 2/8] mm/swap: Add cluster lock
To: "Huang, Ying" <ying.hu...@intel.com>
CC: Jonathan Corbet <cor...@lwn.net>, Tim Chen <tim.c.c...@linux.intel.com>,
t size measuring result is:
If we use bit_spin_lock, the size of cluster_swap_info will,
- increased from 4 bytes to 8 bytes on 64 bit platform
- keep as 4 bytes on 32 bit platform
If we use normal spinlock (queue spinlock), the size of cluster_swap_info will,
- increased from 4 bytes to 8 bytes on 64 bit platform
- increased from 4 bytes to 8 bytes on 32 bit platform
So the difference occurs on 32 bit platform. If the size increment on
32 bit platform is OK, then I think it should be good to use normal
spinlock instead of bit_spin_lock. Personally, I am OK for that. But I
don't know whether there will be some embedded world people don't like
it.
Best Regards,
Huang, Ying
to go this way and how much effort will be
needed.
In contrast, splitting swap cache is quite simple, for implementation
and review. And the effect is good.
Best Regards,
Huang, Ying
> Ccing Nick who might have an interest on lockless page cache.
>
> Thanks.
owpath.__alloc_pages_nodemask.alloc_pages_vma":
2.56,
"perf-profile.calltrace.cycles-pp._raw_spin_lock.get_swap_pages.get_swap_page.add_to_swap.shrink_page_list":
2.47,
The swap out throughput is improved about 192% compared with the
baseline. There are still some lock contention for
swap_info_struct->lock, but the pressure begins to shift to buddy system
now.
Best Regards,
Huang, Ying
Minchan Kim <minc...@kernel.org> writes:
> Hi,
>
> On Thu, Jan 05, 2017 at 09:33:55AM +0800, Huang, Ying wrote:
>> Hi, Minchan,
>>
>> Minchan Kim <minc...@kernel.org> writes:
>> [snip]
>> >
>> > The patchset has used several techniqu
Vincent Guittot <vincent.guit...@linaro.org> writes:
> Hi Dietmar and Ying,
>
> Le Tuesday 03 Jan 2017 11:38:39 (+0100), Dietmar Eggemann a crit :
>> Hi Vincent and Ying,
>>
>> On 01/02/2017 04:42 PM, Vincent Guittot wrote:
>> >Hi Ying,
>>
Minchan Kim <minc...@kernel.org> writes:
> On Wed, Dec 28, 2016 at 11:31:06AM +0800, Huang, Ying wrote:
>
> < snip >
>
>> >>> > Frankly speaking, although I'm huge user of bit_spin_lock(zram/zsmalloc
>> >>> > have used it heavily
"Huang, Ying" <ying.hu...@intel.com> writes:
> Minchan Kim <minc...@kernel.org> writes:
>
>> Hi Huang,
>>
>> On Wed, Dec 28, 2016 at 09:54:27AM +0800, Huang, Ying wrote:
>>
>> < snip >
>>
>>> > The patchset has used
Minchan Kim <minc...@kernel.org> writes:
> Hi Huang,
>
> On Wed, Dec 28, 2016 at 09:54:27AM +0800, Huang, Ying wrote:
>
> < snip >
>
>> > The patchset has used several techniqueus to reduce lock contention, for
>> > example,
>> > batchi
Hi, Jonathan,
On Tue, Oct 25, 2016 at 10:05 AM, Huang, Ying <ying.hu...@intel.com> wrote:
> 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.co
Vincent Guittot <vincent.guit...@linaro.org> writes:
> Le Tuesday 13 Dec 2016 . 09:47:30 (+0800), Huang, Ying a .crit :
>> Hi, Vincent,
>>
>> Vincent Guittot <vincent.guit...@linaro.org> writes:
>>
>> > Hi Ying,
>> >
>>
kly speaking, although I'm huge user of bit_spin_lock(zram/zsmalloc
> have used it heavily), I don't like swap subsystem uses it.
> During zram development, it really hurts debugging due to losing lockdep.
> The reason zram have used it is by size concern of embedded world but server
> would
John Hubbard <jhubb...@nvidia.com> writes:
> On 03/23/2017 07:41 PM, Huang, Ying wrote:
>> David Rientjes <rient...@google.com> writes:
>>
>>> On Mon, 20 Mar 2017, Huang, Ying wrote:
>>>
>>>> From: Huang Ying <ying.hu...@intel.com>
&
David Rientjes <rient...@google.com> writes:
> On Mon, 20 Mar 2017, Huang, Ying wrote:
>
>> From: Huang Ying <ying.hu...@intel.com>
>>
>> Now vzalloc() is used in swap code to allocate various data
>> structures, such as swap cache, swap slots cache,
John Hubbard <jhubb...@nvidia.com> writes:
> On 03/23/2017 09:52 PM, Huang, Ying wrote:
>> John Hubbard <jhubb...@nvidia.com> writes:
>>
>>> On 03/23/2017 07:41 PM, Huang, Ying wrote:
>>>> David Rientjes <rient...@google.com> wri
Johannes Weiner <han...@cmpxchg.org> writes:
> On Tue, Mar 28, 2017 at 01:32:04PM +0800, Huang, Ying wrote:
>> @@ -527,6 +527,23 @@ static inline swp_entry_t get_swap_page(void)
>>
>> #endif /* CONFIG_SWAP */
>>
>> +#ifdef CONFIG_THP_SWA
Johannes Weiner <han...@cmpxchg.org> writes:
> On Tue, Mar 28, 2017 at 01:32:01PM +0800, Huang, Ying wrote:
>> @@ -499,6 +499,19 @@ config FRONTSWAP
>>
>>If unsure, say Y to enable frontswap.
>>
>> +config ARCH_USES_THP_SWAP_CLUSTER
>>
Johannes Weiner <han...@cmpxchg.org> writes:
> On Tue, Mar 28, 2017 at 01:32:09PM +0800, Huang, Ying wrote:
>> @@ -183,12 +184,53 @@ void __delete_from_swap_cache(struct page *page)
>> ADD_CACHE_INFO(del_total, nr);
>> }
>>
>> +#ifdef CONFIG_THP_SWAP
Johannes Weiner <han...@cmpxchg.org> writes:
> On Tue, Mar 28, 2017 at 01:32:02PM +0800, Huang, Ying wrote:
>> @@ -5908,16 +5907,19 @@ void mem_cgroup_swapout(struct page *page,
>> swp_entry_t entry)
>> css_put(>css);
>> }
>>
>
Hi, Andrew,
Andrew Morton <a...@linux-foundation.org> writes:
> On Tue, 28 Mar 2017 13:32:00 +0800 "Huang, Ying" <ying.hu...@intel.com> wrote:
>
>> Hi, Andrew, could you help me to check whether the overall design is
>> reasonable?
>>
>> H
"Kirill A. Shutemov" <kir...@shutemov.name> writes:
> On Tue, Mar 28, 2017 at 01:32:01PM +0800, 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
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>
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
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>
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>
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
swap part of the patchset? Especially [1/9], [3/9], [4/9], [5/9],
[6/9], [9/9].
Hi, Andrea could yo
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>
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>
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>
Before commit 452b94b8c8c7 ("mm/swap: don't BUG_ON() due to
uninitialized swap slot cache"), the following bug is reported,
[ cut here ]
kernel BUG at mm/swap_slots.c:270!
invalid opcode: [#1] SMP
CPU:
and bail
> out when the slot cache hasn't been initialized yet.
Yes. The BUG_ON() is problematic. The initialization of swap slot
cache may fail too, if so, we should still allow using swap without slot
cache. Will send out a fixing patch ASAP.
Best Regards,
Huang, Ying
Hi, Rafeal,
Rafael Aquini <aqu...@redhat.com> writes:
> On Fri, Mar 17, 2017 at 02:46:19PM +0800, Huang, Ying wrote:
>> From: Huang Ying <ying.hu...@intel.com>
>>
>> The commit cbab0e4eec29 ("swap: avoid read_swap_cache_async() race to
>> deadlock whi
Tim Chen <tim.c.c...@linux.intel.com> writes:
> On Wed, 2017-03-15 at 09:19 +0800, Huang, Ying wrote:
>> Tim Chen <tim.c.c...@linux.intel.com> writes:
>>
>> >
>> > On Wed, 2017-03-08 at 15:26 +0800, Huang, Ying wrote:
>>
From: Huang Ying <ying.hu...@intel.com>
To reduce the lock contention of swap_info_struct->lock when freeing
swap entry. The freed swap entries will be collected in a per-CPU
buffer firstly, and be really freed later in batch. During the batch
freeing, if the consecutive swap entries i
From: Huang Ying <ying.hu...@intel.com>
Now vzalloc() is used in swap code to allocate various data
structures, such as swap cache, swap slots cache, cluster info, etc.
Because the size may be too large on some system, so that normal
kzalloc() may fail. But using kzalloc() has some adva
From: Huang Ying <ying.hu...@intel.com>
This is just a cleanup patch, no functionality change. In
cluster_list_add_tail(), spin_lock_nested() is used to lock the
cluster, while unlock_cluster() is used to unlock the cluster. To
improve the code readability. Use spin_unlock() directly to
From: Huang Ying <ying.hu...@intel.com>
Cluster lock is used to protect the swap_cluster_info and
corresponding elements in swap_info_struct->swap_map[]. But it is
found that now in scan_swap_map_slots(), swap_avail_lock may be
acquired when cluster lock is held. This does no good exce
From: Huang Ying <ying.hu...@intel.com>
To reduce the lock contention of swap_info_struct->lock when freeing
swap entry. The freed swap entries will be collected in a per-CPU
buffer firstly, and be really freed later in batch. During the batch
freeing, if the consecutive swap entries i
From: Huang Ying <ying.hu...@intel.com>
The commit cbab0e4eec29 ("swap: avoid read_swap_cache_async() race to
deadlock while waiting on discard I/O completion") fixed a deadlock in
read_swap_cache_async(). Because at that time, in swap allocation
path, a swap entry may be set a
From: Huang Ying <ying.hu...@intel.com>
Now vzalloc() is used in swap code to allocate various data
structures, such as swap cache, swap slots cache, cluster info, etc.
Because the size may be too large on some system, so that normal
kzalloc() may fail. But using kzalloc() has some adva
Tim Chen <tim.c.c...@linux.intel.com> writes:
> On Wed, 2017-03-08 at 15:26 +0800, Huang, Ying wrote:
>> From: Huang Ying <ying.hu...@intel.com>
>>
>> A variation of get_swap_page(), get_huge_swap_page(), is added to
>> allocate a swap cluster (HPA
Tim Chen <tim.c.c...@linux.intel.com> writes:
> On Wed, 2017-03-08 at 15:26 +0800, Huang, Ying wrote:
>> 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 w
Tim Chen <tim.c.c...@linux.intel.com> writes:
> On Wed, 2017-03-08 at 15:26 +0800, Huang, Ying wrote:
>> From: Huang Ying <ying.hu...@intel.com>
>>
>> The swap cluster allocation/free functions are added based on the
>> existing swap cluster managem
Michal Hocko <mho...@kernel.org> writes:
> On Sat 01-04-17 12:47:56, Huang, Ying wrote:
>> Hi, Michal,
>>
>> Michal Hocko <mho...@kernel.org> writes:
>>
>> > On Fri 24-03-17 06:56:10, Dave Hansen wrote:
>> >> On 03/24/2017 12:33 AM
From: Huang Ying <ying.hu...@intel.com>
To reduce the lock contention of swap_info_struct->lock when freeing
swap entry. The freed swap entries will be collected in a per-CPU
buffer firstly, and be really freed later in batch. During the batch
freeing, if the consecutive swap entries i
From: Huang Ying <ying.hu...@intel.com>
This is a code cleanup patch, no functionality changes. There are 2
unused function prototype in swap.h, they are removed.
Signed-off-by: "Huang, Ying" <ying.hu...@intel.com>
Cc: Tim Chen <tim.c.c...@linux.intel.com>
---
inc
From: Huang Ying <ying.hu...@intel.com>
Now vzalloc() is used in swap code to allocate various data
structures, such as swap cache, swap slots cache, cluster info, etc.
Because the size may be too large on some system, so that normal
kzalloc() may fail. But using kzalloc() has some adva
Johannes Weiner <han...@cmpxchg.org> writes:
> On Thu, Mar 30, 2017 at 12:15:13PM +0800, Huang, Ying wrote:
>> Johannes Weiner <han...@cmpxchg.org> writes:
>> > On Tue, Mar 28, 2017 at 01:32:09PM +0800, Huang, Ying wrote:
>> >> @@ -198,6 +240,18 @@
Johannes Weiner <han...@cmpxchg.org> writes:
> On Thu, Mar 30, 2017 at 08:45:56AM +0800, Huang, Ying wrote:
>> Johannes Weiner <han...@cmpxchg.org> writes:
>>
>> > On Tue, Mar 28, 2017 at 01:32:01PM +0800, Huang, Ying wrote:
>> >> @@ -499,6 +499,19
Johannes Weiner <han...@cmpxchg.org> writes:
> On Thu, Mar 30, 2017 at 12:28:17PM +0800, Huang, Ying wrote:
>> Johannes Weiner <han...@cmpxchg.org> writes:
>> > On Tue, Mar 28, 2017 at 01:32:04PM +0800, Huang, Ying wrote:
>> >> @@ -527,6 +527,23 @@ st
ssion. Besides that the swapon path usually happens early
> during the boot where we should have those larger blocks available.
Could I add your Acked-by for this patch?
Best Regards,
Huang, Ying
Rik van Riel <r...@redhat.com> writes:
> On Wed, 2017-04-05 at 15:10 +0800, Huang, Ying wrote:
>> To solve the issue, the per-CPU buffer is sorted according to the
>> swap
>> device before freeing the swap entries. Test shows that the time
>> spent by swapcach
From: Huang Ying <ying.hu...@intel.com>
In the original THP swapping out implementation, before splitting the
THP (Transparent Huage Page), the swap cluster will be allocated and
the THP will be added into the swap cache. But it is possible that
the THP cannot be split, and we must
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 batch the corresponding operation, thus i
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>
If there is no compound map for a THP (Transparent Huge Page), it is
possible that the map count of some sub-pages of the THP is 0. So it
is better to split the THP before swapping out. In this way, the
sub-pages not mapped will be freed, and we can
Andrew Morton <a...@linux-foundation.org> writes:
> On Fri, 7 Apr 2017 14:49:01 +0800 "Huang, Ying" <ying.hu...@intel.com> wrote:
>
>> To reduce the lock contention of swap_info_struct->lock when freeing
>> swap entry. The freed swap entries will
cation.
Is 'XXX' here intended.
> +
> + For selection by architectures with reasonable THP sizes.
> +
> config TRANSPARENT_HUGE_PAGECACHE
> def_bool y
> depends on TRANSPARENT_HUGEPAGE
> diff --git a/mm/huge_memory.c b/mm/huge_memory.c
> index d14dd961f626..4a5c1ca21894 100644
[...]
Best Regards,
Huang, Ying
Johannes Weiner <han...@cmpxchg.org> writes:
> On Thu, Apr 20, 2017 at 08:50:43AM +0800, Huang, Ying wrote:
>> Johannes Weiner <han...@cmpxchg.org> writes:
>> > On Wed, Apr 19, 2017 at 03:06:24PM +0800, Huang, Ying wrote:
>> >> With the patchset, the swa
Balbir Singh <bsinghar...@gmail.com> writes:
> On Wed, 2017-04-19 at 15:06 +0800, Huang, Ying wrote:
>> 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 a
"Huang, Ying" <ying.hu...@intel.com> writes:
> Minchan Kim <minc...@kernel.org> writes:
>
>> On Wed, Apr 19, 2017 at 04:14:43PM +0800, Huang, Ying wrote:
>>> Minchan Kim <minc...@kernel.org> writes:
>>>
>>> > Hi Huang,
&
From: Huang Ying <ying.hu...@intel.com>
In swapcache_free_entries(), if swap_info_get_cont() return NULL,
something wrong occurs for the swap entry. But we should still
continue to free the following swap entries in the array instead of
skip them to avoid swap space leak. This is just p
Andrew Morton <a...@linux-foundation.org> writes:
> On Fri, 7 Apr 2017 14:49:01 +0800 "Huang, Ying" <ying.hu...@intel.com> wrote:
>
>> To reduce the lock contention of swap_info_struct->lock when freeing
>> swap entry. The freed swap entries will
Hi, Johannes,
Johannes Weiner <han...@cmpxchg.org> writes:
> On Wed, Apr 19, 2017 at 03:06:23PM +0800, Huang, Ying wrote:
>> @@ -206,17 +212,34 @@ int add_to_swap(struct page *page, struct list_head
>> *list)
>> */
>> er
Johannes Weiner <han...@cmpxchg.org> writes:
> On Wed, Apr 19, 2017 at 03:06:25PM +0800, Huang, Ying wrote:
>> From: Huang Ying <ying.hu...@intel.com>
>>
>> If there is no compound map for a THP (Transparent Huge Page), it is
>> possible that the map count
Johannes Weiner <han...@cmpxchg.org> writes:
> On Wed, Apr 19, 2017 at 03:06:24PM +0800, Huang, Ying wrote:
>> From: Huang Ying <ying.hu...@intel.com>
>>
>> To swap out THP (Transparent Huage Page), before splitting the THP,
>> the swap cluster will
From: Huang Ying <ying.hu...@intel.com>
If there is no compound map for a THP (Transparent Huge Page), it is
possible that the map count of some sub-pages of the THP is 0. So it
is better to split the THP before swapping out. In this way, the
sub-pages not mapped will be freed, and we can
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 batch the corresponding operation, thus i
From: Huang Ying <ying.hu...@intel.com>
To swap out THP (Transparent Huage Page), before splitting the THP,
the swap cluster will be allocated and the THP will be added into the
swap cache. But it is possible that the THP cannot be split, so that
we must delete the THP from the swap
From: Huang Ying <ying.hu...@intel.com>
This patchset is to optimize the performance of Transparent Huge Page
(THP) swap.
Recently, the performance of the storage devices improved so fast that
we cannot saturate the disk bandwidth with single logical CPU when do
page swap out even on a hi
Minchan Kim <minc...@kernel.org> writes:
> On Wed, Apr 19, 2017 at 04:14:43PM +0800, Huang, Ying wrote:
>> Minchan Kim <minc...@kernel.org> writes:
>>
>> > Hi Huang,
>> >
>> > On Fri, Apr 07, 2017 at 02:49:01PM +0800, Huang, Yi
Tim Chen <tim.c.c...@linux.intel.com> writes:
> On Fri, 2017-04-21 at 20:29 +0800, Huang, Ying wrote:
>> "Huang, Ying" <ying.hu...@intel.com> writes:
>>
>> >
>> > Minchan Kim <minc...@kernel.org> writes:
>> >
>
Minchan Kim <minc...@kernel.org> writes:
> On Fri, Apr 21, 2017 at 08:29:30PM +0800, Huang, Ying wrote:
>> "Huang, Ying" <ying.hu...@intel.com> writes:
>>
>> > Minchan Kim <minc...@kernel.org> writes:
>> >
>> >> On Wed
Hi, Andrew,
Sorry, I clicked the wrong button in my mail client, so forgot Ccing
mailing list. Sorry for duplicated mail.
On Sat, Mar 4, 2017 at 6:43 AM, Andrew Morton <a...@linux-foundation.org> wrote:
> On Wed, 1 Mar 2017 22:38:09 +0800 "Huang, Ying" <ying.hu...@intel.c
Balbir Singh <bsinghar...@gmail.com> writes:
> On Wed, 2017-03-08 at 15:26 +0800, 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
Hi, Matthew,
Matthew Wilcox <wi...@infradead.org> writes:
> On Wed, Mar 08, 2017 at 03:26:05PM +0800, Huang, Ying wrote:
>> 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
&g
From: Huang Ying <ying.hu...@intel.com>
The swap readahead is a important mechanism to reduce the swap in
latency. But the original swap readahead algorithm has some issues.
a) The original swap readahead algorithm does readahead based on the
consecutive blocks in 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>
The swap readahead is a important mechanism to reduce the swap in
latency. But the original swap readahead algorithm has some issues.
a) The original swap readahead algorithm does readahead based on the
consecutive blocks in swap
Vincent Guittot <vincent.guit...@linaro.org> writes:
> Hi Ying,
>
> On 21 February 2017 at 03:40, Huang, Ying <ying.hu...@intel.com> wrote:
>> Hi, Vincent,
>>
>> Vincent Guittot <vincent.guit...@linaro.org> writes:
>
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>
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>
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>
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
swap part of the patchset? Especially [1/9], [3/9], [4/9], [5/9],
[6/9], [9/9].
Hi, Andrea could yo
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