Hello,
I found that ion insert freed-page at the tail of list
and extract at the head.
I think it is good for cache to use the most recently used page
but these pages in pool are not cached memory.
So I'm not sure using hot page is better or not in this case.
What do you think about using hot page first?
-------------------------- 8< -----------------------------
>From 14c8455cc80628e56a27ace9603d29e5056835b5 Mon Sep 17 00:00:00 2001
From: Gioh Kim <[email protected]>
Date: Wed, 29 Oct 2014 13:44:28 +0900
Subject: [PATCH] staging: ion: use hot-page first
A page near the head is hot for cache.
This patch makes pool use hot page first.
Signed-off-by: Gioh Kim <[email protected]>
---
drivers/staging/android/ion/ion_page_pool.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/staging/android/ion/ion_page_pool.c b/drivers/staging/android/ion/ion_page_pool.c
index 5864f3d..3d6ac4f 100644
--- a/drivers/staging/android/ion/ion_page_pool.c
+++ b/drivers/staging/android/ion/ion_page_pool.c
@@ -45,10 +45,10 @@ static int ion_page_pool_add(struct ion_page_pool *pool, struct page *page)
{
mutex_lock(&pool->mutex);
if (PageHighMem(page)) {
- list_add_tail(&page->lru, &pool->high_items);
+ list_add(&page->lru, &pool->high_items);
pool->high_count++;
} else {
- list_add_tail(&page->lru, &pool->low_items);
+ list_add(&page->lru, &pool->low_items);
pool->low_count++;
}
mutex_unlock(&pool->mutex);
--
1.7.9.5
On 10/28/2014 9:57 PM, Gioh Kim wrote:
>
> Hello,
>
> I found that ion insert freed-page at the tail of list
> and extract at the head.
>
> I think it is good for cache to use the most recently used page
> but these pages in pool are not cached memory.
> So I'm not sure using hot page is better or not in this case.
>
> What do you think about using hot page first?
>
This is something that really needs data collection and
benchmarks to see if there is actually an improvement or not.
Thanks,
Laura
--
Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project
2014-10-30 ???? 2:00?? Laura Abbott ??(??) ?? ??:
> On 10/28/2014 9:57 PM, Gioh Kim wrote:
>>
>> Hello,
>>
>> I found that ion insert freed-page at the tail of list
>> and extract at the head.
>>
>> I think it is good for cache to use the most recently used page
>> but these pages in pool are not cached memory.
>> So I'm not sure using hot page is better or not in this case.
>>
>> What do you think about using hot page first?
>>
>
> This is something that really needs data collection and
> benchmarks to see if there is actually an improvement or not.
>
> Thanks,
> Laura
>
>
>
Thank you for always.
I'm looking for a benchmark tool for my platform, but not founding yet.