Hello Andrew,
On 04/04/15 00:58, Andrew Morton wrote:
> On Fri, 03 Apr 2015 15:42:40 +0300 Stefan Strogin <stefan.stro...@gmail.com>
> wrote:
>
>> From: Dmitry Safonov <d.safo...@partner.samsung.com>
>>
>> Here are two functions that provide interface to compute/get used size
>> and size of biggest free chunk in cma region. Add that information to
>> debugfs.
>>
>> ...
>>
>> --- a/mm/cma.c
>> +++ b/mm/cma.c
>> @@ -53,6 +53,36 @@ unsigned long cma_get_size(const struct cma *cma)
>> return cma->count << PAGE_SHIFT;
>> }
>>
>> +unsigned long cma_get_used(struct cma *cma)
>> +{
>> + unsigned long ret = 0;
>> +
>> + mutex_lock(&cma->lock);
>> + /* pages counter is smaller than sizeof(int) */
>> + ret = bitmap_weight(cma->bitmap, (int)cma->count);
>> + mutex_unlock(&cma->lock);
>> +
>> + return ret << cma->order_per_bit;
>> +}
>> +
>> +unsigned long cma_get_maxchunk(struct cma *cma)
>> +{
>> + unsigned long maxchunk = 0;
>> + unsigned long start, end = 0;
>> +
>> + mutex_lock(&cma->lock);
>> + for (;;) {
>> + start = find_next_zero_bit(cma->bitmap, cma->count, end);
>> + if (start >= cma->count)
>> + break;
>> + end = find_next_bit(cma->bitmap, cma->count, start);
>> + maxchunk = max(end - start, maxchunk);
>> + }
>> + mutex_unlock(&cma->lock);
>> +
>> + return maxchunk << cma->order_per_bit;
>> +}
>
> This will cause unused code to be included in cma.o when
> CONFIG_CMA_DEBUGFS=n. Please review the below patch which moves it all
> into cma_debug.c
>
Thank you very much for the reply and for the patches.
>> --- a/mm/cma_debug.c
>> +++ b/mm/cma_debug.c
>> @@ -33,6 +33,28 @@ static int cma_debugfs_get(void *data, u64 *val)
>>
>> DEFINE_SIMPLE_ATTRIBUTE(cma_debugfs_fops, cma_debugfs_get, NULL, "%llu\n");
>>
>> +static int cma_used_get(void *data, u64 *val)
>> +{
>> + struct cma *cma = data;
>> +
>> + *val = cma_get_used(cma);
>> +
>> + return 0;
>> +}
>
> We have cma_used_get() and cma_get_used(). Confusing! Can we think of
> better names for one or both of them?
>
Oh. Excuse me for the bad code.
Wouldn't it be better to merge cma_get_used() and cma_get_maxchunk()
into cma_*_get() as they aren't used anywhere else?
Please see the following patch.
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