On Mon, Jun 04, 2012 at 08:53:56PM +0800, Fengguang Wu wrote:
>Hi Wanpeng,
>
>On Mon, Jun 04, 2012 at 08:40:42PM +0800, Wanpeng Li wrote:
>> From: Wanpeng Li <liwp@xxxxxxxxxxxxxxxxxx>
>>
>> remove no longer use of pdflush interface nr_pdflush_threads.
>
>The patch looks good in itself: the nr_pdflush_threads takes no effect
>for many of the recent kernels. But what's the normal process of
>interface removal? Shall we carry some warning printk for some time
>first or whatever?
Hi, Fengguang,
I also want to add an interface of nr_bdi_writeback_threads to statistic
how many flusher-x:y currently running, do you think it is a good idea?
Regards,
Wanpeng Li
>
>
>> Signed-off-by: Wanpeng Li <liwp@xxxxxxxxxxxxxxxxxx>
>> ---
>> Documentation/sysctl/vm.txt | 11 -----------
>> fs/fs-writeback.c | 5 -----
>> include/linux/writeback.h | 5 -----
>> kernel/sysctl.c | 7 -------
>> 4 files changed, 28 deletions(-)
>>
>> diff --git a/Documentation/sysctl/vm.txt b/Documentation/sysctl/vm.txt
>> index 96f0ee8..71c17d2 100644
>> --- a/Documentation/sysctl/vm.txt
>> +++ b/Documentation/sysctl/vm.txt
>> @@ -42,7 +42,6 @@ Currently, these files are in /proc/sys/vm:
>> - mmap_min_addr
>> - nr_hugepages
>> - nr_overcommit_hugepages
>> -- nr_pdflush_threads
>> - nr_trim_pages (only if CONFIG_MMU=n)
>> - numa_zonelist_order
>> - oom_dump_tasks
>> @@ -426,16 +425,6 @@ See Documentation/vm/hugetlbpage.txt
>>
>> ==============================================================
>>
>> -nr_pdflush_threads
>> -
>> -The current number of pdflush threads. This value is read-only.
>> -The value changes according to the number of dirty pages in the system.
>> -
>> -When necessary, additional pdflush threads are created, one per second, up to
>> -nr_pdflush_threads_max.
>> -
>> -==============================================================
>> -
>> nr_trim_pages
>>
>> This is available only on NOMMU kernels.
>> diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
>> index 539f36c..30ddb8a 100644
>> --- a/fs/fs-writeback.c
>> +++ b/fs/fs-writeback.c
>> @@ -52,11 +52,6 @@ struct wb_writeback_work {
>> struct completion *done; /* set if the caller waits */
>> };
>>
>> -/*
>> - * We don't actually have pdflush, but this one is exported though /proc...
>> - */
>> -int nr_pdflush_threads;
>> -
>> /**
>> * writeback_in_progress - determine whether there is writeback in progress
>> * @bdi: the device's backing_dev_info structure.
>> diff --git a/include/linux/writeback.h b/include/linux/writeback.h
>> index a2b84f5..13b5df7 100644
>> --- a/include/linux/writeback.h
>> +++ b/include/linux/writeback.h
>> @@ -193,9 +193,4 @@ void tag_pages_for_writeback(struct address_space *mapping,
>>
>> void account_page_redirty(struct page *page);
>>
>> -/* pdflush.c */
>> -extern int nr_pdflush_threads; /* Global so it can be exported to sysctl
>> - read-only. */
>> -
>> -
>> #endif /* WRITEBACK_H */
>> diff --git a/kernel/sysctl.c b/kernel/sysctl.c
>> index 4ab1187..e257b61 100644
>> --- a/kernel/sysctl.c
>> +++ b/kernel/sysctl.c
>> @@ -1095,13 +1095,6 @@ static struct ctl_table vm_table[] = {
>> .extra1 = &zero,
>> },
>> {
>> - .procname = "nr_pdflush_threads",
>> - .data = &nr_pdflush_threads,
>> - .maxlen = sizeof nr_pdflush_threads,
>> - .mode = 0444 /* read-only*/,
>> - .proc_handler = proc_dointvec,
>> - },
>> - {
>> .procname = "swappiness",
>> .data = &vm_swappiness,
>> .maxlen = sizeof(vm_swappiness),
>> --
>> 1.7.9.5
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