[PATCH v4] Improve the performance of --num-threads -d 31
"Zhou, Wenjian/周文剑"
zhouwj-fnst at cn.fujitsu.com
Wed Mar 16 01:59:34 PDT 2016
Hi Minfei,
Thanks a lot for your information!
According to your description and strace log,
it seems there is something wrong in initial_for_parallel().
I reviewed the relevant code, but haven't got any idea.
And I have one more question.
Does it happen every time with the same command?
--
Thanks
Zhou
On 03/16/2016 04:32 PM, Minfei Huang wrote:
>
>> On Mar 16, 2016, at 16:26, Zhou, Wenjian/周文剑 <zhouwj-fnst at cn.fujitsu.com> wrote:
>>
>> On 03/16/2016 04:04 PM, Minfei Huang wrote:
>>> On 03/16/16 at 09:55am, "Zhou, Wenjian/周文剑" wrote:
>>>> Hi Minfei,
>>>>
>>>> I have some questions.
>>>>
>>>> If the value of num-threads is 8,
>>>> 1. How much is the free memory before running makedumpfile failed?
>>>
>>> Hmm, this machine is reserved by other, I have no access to take a look
>>> about reserved memory. All of the configuration are set by default.
>>> Maybe it's about 420M.
>>>
>>
>> I don't mean the reserved memory.
>> I mean the free memory.
>
> Sorry, there is no record about such info.
>
>>
>>>>
>>>> 2. How much is the free memory before running makedumpfile success?
>>>
>>> I don't memtion this during testing it.
>>>
>>>>
>>>>
>>>> And the following result is very strange if all cache has been dropped.
>>>> makedumpfile --num-threads 30 -d 31
>>>> real 0m0.006s
>>>> user 0m0.002s
>>>> sys 0m0.004s
>>>
>>> For this case, makedumpfile fails to dump vmcore with option
>>> --num-threads 30.
>>>
>>> I suspect the following output from strace.
>>>
>>>>> 1313 mmap(NULL, 18446744048584388608, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = -1 ENOMEM (Cannot allocate memory)
>>>>> 1314 mmap(NULL, 18446744048584523776, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = -1 ENOMEM (Cannot allocate memory)
>>>>> 1315 mmap(NULL, 134217728, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_NORESERVE, -1, 0) = 0x7f5927bb2000
>>
>> I see.
>>
>> Is there any error messages?
>> Such as "out of memory”?
>
> the allocated memory is too large 18446744048584388608?
>
>>
>> How about it without the patch?
>
> It works well without this patch from my test.
>
>>
>> Will it occur if double the reserved memory?
>
> No. I just tested all of the test cases.
>
>>
>> BTW, can it be reproduced in other machines?
>
> No, I have only one with such large memory.
>
>> I haven't get such result in my machine yet.
>>
>> In my machine, the number of free memory will not always the same
>> after executing makedumpfile each time.
>> So if there is not enough memory, makedumpfile will fail sometimes.
>> But I'm not sure whether they are the same issue.
>>
>> --
>> Thanks
>> Zhou
>>
>>>
>>> Thanks
>>> Minfei
>>>
>>>>
>>>> --
>>>> Thanks
>>>> Zhou
>>>>
>>>> On 03/15/2016 05:33 PM, Minfei Huang wrote:
>>>>> On 03/15/16 at 03:12pm, "Zhou, Wenjian/周文剑" wrote:
>>>>>> Hello Minfei,
>>>>>>
>>>>>> I guess the result is affected by the caches.
>>>>>> How about executing the following command before running makedumpfile each time?
>>>>>> # echo 3 > /proc/sys/vm/drop_caches
>>>>>
>>>>> Hi, Zhou.
>>>>>
>>>>> Seem there is a bug during dumping vmcore with option num-threads.
>>>>>
>>>>> 1307 open("/proc/meminfo", O_RDONLY) = 4
>>>>> 1308 fstat(4, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
>>>>> 1309 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f59322d3000
>>>>> 1310 read(4, "MemTotal: 385452 kB\nMemF"..., 1024) = 1024
>>>>> 1311 close(4) = 0
>>>>> 1312 munmap(0x7f59322d3000, 4096) = 0
>>>>> 1313 mmap(NULL, 18446744048584388608, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = -1 ENOMEM (Cannot allocate memory)
>>>>> 1314 mmap(NULL, 18446744048584523776, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = -1 ENOMEM (Cannot allocate memory)
>>>>> 1315 mmap(NULL, 134217728, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_NORESERVE, -1, 0) = 0x7f5927bb2000
>>>>> 1316 munmap(0x7f5927bb2000, 4513792) = 0
>>>>> 1317 munmap(0x7f592c000000, 62595072) = 0
>>>>> 1318 mprotect(0x7f5928000000, 135168, PROT_READ|PROT_WRITE) = 0
>>>>> 1319 mmap(NULL, 18446744048584388608, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = -1 ENOMEM (Cannot allocate memory)
>>>>>
>>>>> Thanks
>>>>> Minfei
>>>>>
>>>>>>
>>>>>> --
>>>>>> Thanks
>>>>>> Zhou
>>>>>>
>>>>>> On 03/15/2016 02:34 PM, Minfei Huang wrote:
>>>>>>> Hi, Zhou.
>>>>>>>
>>>>>>> I have applied this patch base on 1.5.9. There are several testcases I
>>>>>>> have tested.
>>>>>>>
>>>>>>> - makedumpfile --num-threads 64 -d 31
>>>>>>> real 0m0.010s
>>>>>>> user 0m0.002s
>>>>>>> sys 0m0.009s
>>>>>>>
>>>>>>> - makedumpfile --num-threads 31 -d 31
>>>>>>> real 2m40.915s
>>>>>>> user 10m50.900s
>>>>>>> sys 23m9.664s
>>>>>>>
>>>>>>> makedumpfile --num-threads 30 -d 31
>>>>>>> real 0m0.006s
>>>>>>> user 0m0.002s
>>>>>>> sys 0m0.004s
>>>>>>>
>>>>>>> makedumpfile --num-threads 32 -d 31
>>>>>>> real 0m0.007s
>>>>>>> user 0m0.002s
>>>>>>> sys 0m0.005s
>>>>>>>
>>>>>>> - makedumpfile --num-threads 8 -d 31
>>>>>>> real 2m32.692s
>>>>>>> user 7m4.630s
>>>>>>> sys 2m0.369s
>>>>>>>
>>>>>>> - makedumpfile --num-threads 1 -d 31
>>>>>>> real 4m42.423s
>>>>>>> user 7m27.153s
>>>>>>> sys 0m22.490s
>>>>>>>
>>>>>>> - makedumpfile.orig -d 31
>>>>>>> real 4m1.297s
>>>>>>> user 3m39.696s
>>>>>>> sys 0m15.200s
>>>>>>>
>>>>>>> This patch has a huge increment to the filter performance under 31. But
>>>>>>> it is not stable, since makedumpfile fails to dump vmcore intermittently.
>>>>>>> You can find the above test result, makedumpfile fails to dump vmcore
>>>>>>> with option --num-threads 64, also it may occur with option
>>>>>>> --number-threads 8.
>>>>>>>
>>>>>>> Thanks
>>>>>>> Minfei
>>>>>>>
>>>>>>> On 03/09/16 at 08:27am, Zhou Wenjian wrote:
>>>>>>>> v4:
>>>>>>>> 1. fix a bug caused by the logic
>>>>>>>> v3:
>>>>>>>> 1. remove some unused variables
>>>>>>>> 2. fix a bug caused by the wrong logic
>>>>>>>> 3. fix a bug caused by optimising
>>>>>>>> 4. improve more performance by using Minoru Usui's code
>>>>>>>>
>>>>>>>> multi-threads implementation will introduce extra cost when handling
>>>>>>>> each page. The origin implementation will also do the extra work for
>>>>>>>> filtered pages. So there is a big performance degradation in
>>>>>>>> --num-threads -d 31.
>>>>>>>> The new implementation won't do the extra work for filtered pages any
>>>>>>>> more. So the performance of -d 31 is close to that of serial processing.
>>>>>>>>
>>>>>>>> The new implementation is just like the following:
>>>>>>>> * The basic idea is producer producing page and consumer writing page.
>>>>>>>> * Each producer have a page_flag_buf list which is used for storing
>>>>>>>> page's description.
>>>>>>>> * The size of page_flag_buf is little so it won't take too much memory.
>>>>>>>> * And all producers will share a page_data_buf array which is
>>>>>>>> used for storing page's compressed data.
>>>>>>>> * The main thread is the consumer. It will find the next pfn and write
>>>>>>>> it into file.
>>>>>>>> * The next pfn is smallest pfn in all page_flag_buf.
>>>>>>>>
>>>>>>>> Signed-off-by: Minoru Usui <min-usui at ti.jp.nec.com>
>>>>>>>> Signed-off-by: Zhou Wenjian <zhouwj-fnst at cn.fujitsu.com>
>>>>>>>> ---
>>>>>>>> makedumpfile.c | 298 +++++++++++++++++++++++++++++++++++----------------------
>>>>>>>> makedumpfile.h | 35 ++++---
>>>>>>>> 2 files changed, 202 insertions(+), 131 deletions(-)
>>>>>>>>
>>>>>>>> diff --git a/makedumpfile.c b/makedumpfile.c
>>>>>>>> index fa0b779..2b0864a 100644
>>>>>>>> --- a/makedumpfile.c
>>>>>>>> +++ b/makedumpfile.c
>>>>>>>> @@ -3483,7 +3483,8 @@ initial_for_parallel()
>>>>>>>> unsigned long page_data_buf_size;
>>>>>>>> unsigned long limit_size;
>>>>>>>> int page_data_num;
>>>>>>>> - int i;
>>>>>>>> + struct page_flag *current;
>>>>>>>> + int i, j;
>>>>>>>>
>>>>>>>> len_buf_out = calculate_len_buf_out(info->page_size);
>>>>>>>>
>>>>>>>> @@ -3560,10 +3561,16 @@ initial_for_parallel()
>>>>>>>>
>>>>>>>> limit_size = (get_free_memory_size()
>>>>>>>> - MAP_REGION * info->num_threads) * 0.6;
>>>>>>>> + if (limit_size < 0) {
>>>>>>>> + MSG("Free memory is not enough for multi-threads\n");
>>>>>>>> + return FALSE;
>>>>>>>> + }
>>>>>>>>
>>>>>>>> page_data_num = limit_size / page_data_buf_size;
>>>>>>>> + info->num_buffers = 3 * info->num_threads;
>>>>>>>>
>>>>>>>> - info->num_buffers = MIN(NUM_BUFFERS, page_data_num);
>>>>>>>> + info->num_buffers = MAX(info->num_buffers, NUM_BUFFERS);
>>>>>>>> + info->num_buffers = MIN(info->num_buffers, page_data_num);
>>>>>>>>
>>>>>>>> DEBUG_MSG("Number of struct page_data for produce/consume: %d\n",
>>>>>>>> info->num_buffers);
>>>>>>>> @@ -3588,6 +3595,36 @@ initial_for_parallel()
>>>>>>>> }
>>>>>>>>
>>>>>>>> /*
>>>>>>>> + * initial page_flag for each thread
>>>>>>>> + */
>>>>>>>> + if ((info->page_flag_buf = malloc(sizeof(void *) * info->num_threads))
>>>>>>>> + == NULL) {
>>>>>>>> + MSG("Can't allocate memory for page_flag_buf. %s\n",
>>>>>>>> + strerror(errno));
>>>>>>>> + return FALSE;
>>>>>>>> + }
>>>>>>>> + memset(info->page_flag_buf, 0, sizeof(void *) * info->num_threads);
>>>>>>>> +
>>>>>>>> + for (i = 0; i < info->num_threads; i++) {
>>>>>>>> + if ((info->page_flag_buf[i] = calloc(1, sizeof(struct page_flag))) == NULL) {
>>>>>>>> + MSG("Can't allocate memory for page_flag. %s\n",
>>>>>>>> + strerror(errno));
>>>>>>>> + return FALSE;
>>>>>>>> + }
>>>>>>>> + current = info->page_flag_buf[i];
>>>>>>>> +
>>>>>>>> + for (j = 1; j < NUM_BUFFERS; j++) {
>>>>>>>> + if ((current->next = calloc(1, sizeof(struct page_flag))) == NULL) {
>>>>>>>> + MSG("Can't allocate memory for page_flag. %s\n",
>>>>>>>> + strerror(errno));
>>>>>>>> + return FALSE;
>>>>>>>> + }
>>>>>>>> + current = current->next;
>>>>>>>> + }
>>>>>>>> + current->next = info->page_flag_buf[i];
>>>>>>>> + }
>>>>>>>> +
>>>>>>>> + /*
>>>>>>>> * initial fd_memory for threads
>>>>>>>> */
>>>>>>>> for (i = 0; i < info->num_threads; i++) {
>>>>>>>> @@ -3612,7 +3649,8 @@ initial_for_parallel()
>>>>>>>> void
>>>>>>>> free_for_parallel()
>>>>>>>> {
>>>>>>>> - int i;
>>>>>>>> + int i, j;
>>>>>>>> + struct page_flag *current;
>>>>>>>>
>>>>>>>> if (info->threads != NULL) {
>>>>>>>> for (i = 0; i < info->num_threads; i++) {
>>>>>>>> @@ -3655,6 +3693,19 @@ free_for_parallel()
>>>>>>>> free(info->page_data_buf);
>>>>>>>> }
>>>>>>>>
>>>>>>>> + if (info->page_flag_buf != NULL) {
>>>>>>>> + for (i = 0; i < info->num_threads; i++) {
>>>>>>>> + for (j = 0; j < NUM_BUFFERS; j++) {
>>>>>>>> + if (info->page_flag_buf[i] != NULL) {
>>>>>>>> + current = info->page_flag_buf[i];
>>>>>>>> + info->page_flag_buf[i] = current->next;
>>>>>>>> + free(current);
>>>>>>>> + }
>>>>>>>> + }
>>>>>>>> + }
>>>>>>>> + free(info->page_flag_buf);
>>>>>>>> + }
>>>>>>>> +
>>>>>>>> if (info->parallel_info == NULL)
>>>>>>>> return;
>>>>>>>>
>>>>>>>> @@ -7075,11 +7126,11 @@ void *
>>>>>>>> kdump_thread_function_cyclic(void *arg) {
>>>>>>>> void *retval = PTHREAD_FAIL;
>>>>>>>> struct thread_args *kdump_thread_args = (struct thread_args *)arg;
>>>>>>>> - struct page_data *page_data_buf = kdump_thread_args->page_data_buf;
>>>>>>>> + volatile struct page_data *page_data_buf = kdump_thread_args->page_data_buf;
>>>>>>>> + volatile struct page_flag *page_flag_buf = kdump_thread_args->page_flag_buf;
>>>>>>>> struct cycle *cycle = kdump_thread_args->cycle;
>>>>>>>> - int page_data_num = kdump_thread_args->page_data_num;
>>>>>>>> - mdf_pfn_t pfn;
>>>>>>>> - int index;
>>>>>>>> + mdf_pfn_t pfn = cycle->start_pfn;
>>>>>>>> + int index = kdump_thread_args->thread_num;
>>>>>>>> int buf_ready;
>>>>>>>> int dumpable;
>>>>>>>> int fd_memory = 0;
>>>>>>>> @@ -7125,47 +7176,48 @@ kdump_thread_function_cyclic(void *arg) {
>>>>>>>> kdump_thread_args->thread_num);
>>>>>>>> }
>>>>>>>>
>>>>>>>> - while (1) {
>>>>>>>> - /* get next pfn */
>>>>>>>> - pthread_mutex_lock(&info->current_pfn_mutex);
>>>>>>>> - pfn = info->current_pfn;
>>>>>>>> - info->current_pfn++;
>>>>>>>> - pthread_mutex_unlock(&info->current_pfn_mutex);
>>>>>>>> -
>>>>>>>> - if (pfn >= kdump_thread_args->end_pfn)
>>>>>>>> - break;
>>>>>>>> -
>>>>>>>> - index = -1;
>>>>>>>> + /*
>>>>>>>> + * filtered page won't take anything
>>>>>>>> + * unfiltered zero page will only take a page_flag_buf
>>>>>>>> + * unfiltered non-zero page will take a page_flag_buf and a page_data_buf
>>>>>>>> + */
>>>>>>>> + while (pfn < cycle->end_pfn) {
>>>>>>>> buf_ready = FALSE;
>>>>>>>>
>>>>>>>> + pthread_mutex_lock(&info->page_data_mutex);
>>>>>>>> + while (page_data_buf[index].used != FALSE) {
>>>>>>>> + index = (index + 1) % info->num_buffers;
>>>>>>>> + }
>>>>>>>> + page_data_buf[index].used = TRUE;
>>>>>>>> + pthread_mutex_unlock(&info->page_data_mutex);
>>>>>>>> +
>>>>>>>> while (buf_ready == FALSE) {
>>>>>>>> pthread_testcancel();
>>>>>>>> -
>>>>>>>> - index = pfn % page_data_num;
>>>>>>>> -
>>>>>>>> - if (pfn - info->consumed_pfn > info->num_buffers)
>>>>>>>> + if (page_flag_buf->ready == FLAG_READY)
>>>>>>>> continue;
>>>>>>>>
>>>>>>>> - if (page_data_buf[index].ready != 0)
>>>>>>>> - continue;
>>>>>>>> -
>>>>>>>> - pthread_mutex_lock(&page_data_buf[index].mutex);
>>>>>>>> -
>>>>>>>> - if (page_data_buf[index].ready != 0)
>>>>>>>> - goto unlock;
>>>>>>>> -
>>>>>>>> - buf_ready = TRUE;
>>>>>>>> + /* get next dumpable pfn */
>>>>>>>> + pthread_mutex_lock(&info->current_pfn_mutex);
>>>>>>>> + for (pfn = info->current_pfn; pfn < cycle->end_pfn; pfn++) {
>>>>>>>> + dumpable = is_dumpable(
>>>>>>>> + info->fd_bitmap ? &bitmap_parallel : info->bitmap2,
>>>>>>>> + pfn,
>>>>>>>> + cycle);
>>>>>>>> + if (dumpable)
>>>>>>>> + break;
>>>>>>>> + }
>>>>>>>> + info->current_pfn = pfn + 1;
>>>>>>>>
>>>>>>>> - page_data_buf[index].pfn = pfn;
>>>>>>>> - page_data_buf[index].ready = 1;
>>>>>>>> + page_flag_buf->pfn = pfn;
>>>>>>>> + page_flag_buf->ready = FLAG_FILLING;
>>>>>>>> + pthread_mutex_unlock(&info->current_pfn_mutex);
>>>>>>>> + sem_post(&info->page_flag_buf_sem);
>>>>>>>>
>>>>>>>> - dumpable = is_dumpable(
>>>>>>>> - info->fd_bitmap ? &bitmap_parallel : info->bitmap2,
>>>>>>>> - pfn,
>>>>>>>> - cycle);
>>>>>>>> - page_data_buf[index].dumpable = dumpable;
>>>>>>>> - if (!dumpable)
>>>>>>>> - goto unlock;
>>>>>>>> + if (pfn >= cycle->end_pfn) {
>>>>>>>> + info->current_pfn = cycle->end_pfn;
>>>>>>>> + page_data_buf[index].used = FALSE;
>>>>>>>> + break;
>>>>>>>> + }
>>>>>>>>
>>>>>>>> if (!read_pfn_parallel(fd_memory, pfn, buf,
>>>>>>>> &bitmap_memory_parallel,
>>>>>>>> @@ -7178,11 +7230,11 @@ kdump_thread_function_cyclic(void *arg) {
>>>>>>>>
>>>>>>>> if ((info->dump_level & DL_EXCLUDE_ZERO)
>>>>>>>> && is_zero_page(buf, info->page_size)) {
>>>>>>>> - page_data_buf[index].zero = TRUE;
>>>>>>>> - goto unlock;
>>>>>>>> + page_flag_buf->zero = TRUE;
>>>>>>>> + goto next;
>>>>>>>> }
>>>>>>>>
>>>>>>>> - page_data_buf[index].zero = FALSE;
>>>>>>>> + page_flag_buf->zero = FALSE;
>>>>>>>>
>>>>>>>> /*
>>>>>>>> * Compress the page data.
>>>>>>>> @@ -7210,6 +7262,7 @@ kdump_thread_function_cyclic(void *arg) {
>>>>>>>> page_data_buf[index].flags =
>>>>>>>> DUMP_DH_COMPRESSED_LZO;
>>>>>>>> page_data_buf[index].size = size_out;
>>>>>>>> +
>>>>>>>> memcpy(page_data_buf[index].buf, buf_out, size_out);
>>>>>>>> #endif
>>>>>>>> #ifdef USESNAPPY
>>>>>>>> @@ -7232,12 +7285,14 @@ kdump_thread_function_cyclic(void *arg) {
>>>>>>>> page_data_buf[index].size = info->page_size;
>>>>>>>> memcpy(page_data_buf[index].buf, buf, info->page_size);
>>>>>>>> }
>>>>>>>> -unlock:
>>>>>>>> - pthread_mutex_unlock(&page_data_buf[index].mutex);
>>>>>>>> + page_flag_buf->index = index;
>>>>>>>> + buf_ready = TRUE;
>>>>>>>> +next:
>>>>>>>> + page_flag_buf->ready = FLAG_READY;
>>>>>>>> + page_flag_buf = page_flag_buf->next;
>>>>>>>>
>>>>>>>> }
>>>>>>>> }
>>>>>>>> -
>>>>>>>> retval = NULL;
>>>>>>>>
>>>>>>>> fail:
>>>>>>>> @@ -7265,14 +7320,15 @@ write_kdump_pages_parallel_cyclic(struct cache_data *cd_header,
>>>>>>>> struct page_desc pd;
>>>>>>>> struct timeval tv_start;
>>>>>>>> struct timeval last, new;
>>>>>>>> - unsigned long long consuming_pfn;
>>>>>>>> pthread_t **threads = NULL;
>>>>>>>> struct thread_args *kdump_thread_args = NULL;
>>>>>>>> void *thread_result;
>>>>>>>> - int page_data_num;
>>>>>>>> + int page_buf_num;
>>>>>>>> struct page_data *page_data_buf = NULL;
>>>>>>>> int i;
>>>>>>>> int index;
>>>>>>>> + int end_count, consuming, check_count;
>>>>>>>> + mdf_pfn_t current_pfn, temp_pfn;
>>>>>>>>
>>>>>>>> if (info->flag_elf_dumpfile)
>>>>>>>> return FALSE;
>>>>>>>> @@ -7284,13 +7340,6 @@ write_kdump_pages_parallel_cyclic(struct cache_data *cd_header,
>>>>>>>> goto out;
>>>>>>>> }
>>>>>>>>
>>>>>>>> - res = pthread_mutex_init(&info->consumed_pfn_mutex, NULL);
>>>>>>>> - if (res != 0) {
>>>>>>>> - ERRMSG("Can't initialize consumed_pfn_mutex. %s\n",
>>>>>>>> - strerror(res));
>>>>>>>> - goto out;
>>>>>>>> - }
>>>>>>>> -
>>>>>>>> res = pthread_mutex_init(&info->filter_mutex, NULL);
>>>>>>>> if (res != 0) {
>>>>>>>> ERRMSG("Can't initialize filter_mutex. %s\n", strerror(res));
>>>>>>>> @@ -7314,36 +7363,23 @@ write_kdump_pages_parallel_cyclic(struct cache_data *cd_header,
>>>>>>>> end_pfn = cycle->end_pfn;
>>>>>>>>
>>>>>>>> info->current_pfn = start_pfn;
>>>>>>>> - info->consumed_pfn = start_pfn - 1;
>>>>>>>>
>>>>>>>> threads = info->threads;
>>>>>>>> kdump_thread_args = info->kdump_thread_args;
>>>>>>>>
>>>>>>>> - page_data_num = info->num_buffers;
>>>>>>>> + page_buf_num = info->num_buffers;
>>>>>>>> page_data_buf = info->page_data_buf;
>>>>>>>> + pthread_mutex_init(&info->page_data_mutex, NULL);
>>>>>>>> + sem_init(&info->page_flag_buf_sem, 0, 0);
>>>>>>>>
>>>>>>>> - for (i = 0; i < page_data_num; i++) {
>>>>>>>> - /*
>>>>>>>> - * producer will use pfn in page_data_buf to decide the
>>>>>>>> - * consumed pfn
>>>>>>>> - */
>>>>>>>> - page_data_buf[i].pfn = start_pfn - 1;
>>>>>>>> - page_data_buf[i].ready = 0;
>>>>>>>> - res = pthread_mutex_init(&page_data_buf[i].mutex, NULL);
>>>>>>>> - if (res != 0) {
>>>>>>>> - ERRMSG("Can't initialize mutex of page_data_buf. %s\n",
>>>>>>>> - strerror(res));
>>>>>>>> - goto out;
>>>>>>>> - }
>>>>>>>> - }
>>>>>>>> + for (i = 0; i < page_buf_num; i++)
>>>>>>>> + page_data_buf[i].used = FALSE;
>>>>>>>>
>>>>>>>> for (i = 0; i < info->num_threads; i++) {
>>>>>>>> kdump_thread_args[i].thread_num = i;
>>>>>>>> kdump_thread_args[i].len_buf_out = len_buf_out;
>>>>>>>> - kdump_thread_args[i].start_pfn = start_pfn;
>>>>>>>> - kdump_thread_args[i].end_pfn = end_pfn;
>>>>>>>> - kdump_thread_args[i].page_data_num = page_data_num;
>>>>>>>> kdump_thread_args[i].page_data_buf = page_data_buf;
>>>>>>>> + kdump_thread_args[i].page_flag_buf = info->page_flag_buf[i];
>>>>>>>> kdump_thread_args[i].cycle = cycle;
>>>>>>>>
>>>>>>>> res = pthread_create(threads[i], NULL,
>>>>>>>> @@ -7356,55 +7392,88 @@ write_kdump_pages_parallel_cyclic(struct cache_data *cd_header,
>>>>>>>> }
>>>>>>>> }
>>>>>>>>
>>>>>>>> - consuming_pfn = start_pfn;
>>>>>>>> - index = -1;
>>>>>>>> + end_count = 0;
>>>>>>>> + while (1) {
>>>>>>>> + consuming = 0;
>>>>>>>> + check_count = 0;
>>>>>>>>
>>>>>>>> - gettimeofday(&last, NULL);
>>>>>>>> + /*
>>>>>>>> + * The basic idea is producer producing page and consumer writing page.
>>>>>>>> + * Each producer have a page_flag_buf list which is used for storing page's description.
>>>>>>>> + * The size of page_flag_buf is little so it won't take too much memory.
>>>>>>>> + * And all producers will share a page_data_buf array which is used for storing page's compressed data.
>>>>>>>> + * The main thread is the consumer. It will find the next pfn and write it into file.
>>>>>>>> + * The next pfn is smallest pfn in all page_flag_buf.
>>>>>>>> + */
>>>>>>>> + sem_wait(&info->page_flag_buf_sem);
>>>>>>>> + gettimeofday(&last, NULL);
>>>>>>>> + while (1) {
>>>>>>>> + current_pfn = end_pfn;
>>>>>>>>
>>>>>>>> - while (consuming_pfn < end_pfn) {
>>>>>>>> - index = consuming_pfn % page_data_num;
>>>>>>>> + /*
>>>>>>>> + * page_flag_buf is in circular linked list.
>>>>>>>> + * The array info->page_flag_buf[] records the current page_flag_buf in each thread's
>>>>>>>> + * page_flag_buf list.
>>>>>>>> + * consuming is used for recording in which thread the pfn is the smallest.
>>>>>>>> + * current_pfn is used for recording the value of pfn when checking the pfn.
>>>>>>>> + */
>>>>>>>> + for (i = 0; i < info->num_threads; i++) {
>>>>>>>> + if (info->page_flag_buf[i]->ready == FLAG_UNUSED)
>>>>>>>> + continue;
>>>>>>>> + temp_pfn = info->page_flag_buf[i]->pfn;
>>>>>>>>
>>>>>>>> - gettimeofday(&new, NULL);
>>>>>>>> - if (new.tv_sec - last.tv_sec > WAIT_TIME) {
>>>>>>>> - ERRMSG("Can't get data of pfn %llx.\n", consuming_pfn);
>>>>>>>> - goto out;
>>>>>>>> - }
>>>>>>>> + /*
>>>>>>>> + * count how many threads have reached the end.
>>>>>>>> + */
>>>>>>>> + if (temp_pfn >= end_pfn) {
>>>>>>>> + info->page_flag_buf[i]->ready = FLAG_UNUSED;
>>>>>>>> + end_count++;
>>>>>>>> + continue;
>>>>>>>> + }
>>>>>>>>
>>>>>>>> - /*
>>>>>>>> - * check pfn first without mutex locked to reduce the time
>>>>>>>> - * trying to lock the mutex
>>>>>>>> - */
>>>>>>>> - if (page_data_buf[index].pfn != consuming_pfn)
>>>>>>>> - continue;
>>>>>>>> + if (current_pfn < temp_pfn)
>>>>>>>> + continue;
>>>>>>>>
>>>>>>>> - if (pthread_mutex_trylock(&page_data_buf[index].mutex) != 0)
>>>>>>>> - continue;
>>>>>>>> + check_count++;
>>>>>>>> + consuming = i;
>>>>>>>> + current_pfn = temp_pfn;
>>>>>>>> + }
>>>>>>>>
>>>>>>>> - /* check whether the found one is ready to be consumed */
>>>>>>>> - if (page_data_buf[index].pfn != consuming_pfn ||
>>>>>>>> - page_data_buf[index].ready != 1) {
>>>>>>>> - goto unlock;
>>>>>>>> + /*
>>>>>>>> + * If all the threads have reached the end, we will finish writing.
>>>>>>>> + */
>>>>>>>> + if (end_count >= info->num_threads)
>>>>>>>> + goto finish;
>>>>>>>> +
>>>>>>>> + /*
>>>>>>>> + * If the page_flag_buf is not ready, the pfn recorded may be changed.
>>>>>>>> + * So we should recheck.
>>>>>>>> + */
>>>>>>>> + if (info->page_flag_buf[consuming]->ready != FLAG_READY) {
>>>>>>>> + gettimeofday(&new, NULL);
>>>>>>>> + if (new.tv_sec - last.tv_sec > WAIT_TIME) {
>>>>>>>> + ERRMSG("Can't get data of pfn.\n");
>>>>>>>> + goto out;
>>>>>>>> + }
>>>>>>>> + continue;
>>>>>>>> + }
>>>>>>>> +
>>>>>>>> + if (current_pfn == info->page_flag_buf[consuming]->pfn)
>>>>>>>> + break;
>>>>>>>> }
>>>>>>>>
>>>>>>>> if ((num_dumped % per) == 0)
>>>>>>>> print_progress(PROGRESS_COPY, num_dumped, info->num_dumpable);
>>>>>>>>
>>>>>>>> - /* next pfn is found, refresh last here */
>>>>>>>> - last = new;
>>>>>>>> - consuming_pfn++;
>>>>>>>> - info->consumed_pfn++;
>>>>>>>> - page_data_buf[index].ready = 0;
>>>>>>>> -
>>>>>>>> - if (page_data_buf[index].dumpable == FALSE)
>>>>>>>> - goto unlock;
>>>>>>>> -
>>>>>>>> num_dumped++;
>>>>>>>>
>>>>>>>> - if (page_data_buf[index].zero == TRUE) {
>>>>>>>> +
>>>>>>>> + if (info->page_flag_buf[consuming]->zero == TRUE) {
>>>>>>>> if (!write_cache(cd_header, pd_zero, sizeof(page_desc_t)))
>>>>>>>> goto out;
>>>>>>>> pfn_zero++;
>>>>>>>> } else {
>>>>>>>> + index = info->page_flag_buf[consuming]->index;
>>>>>>>> pd.flags = page_data_buf[index].flags;
>>>>>>>> pd.size = page_data_buf[index].size;
>>>>>>>> pd.page_flags = 0;
>>>>>>>> @@ -7420,12 +7489,12 @@ write_kdump_pages_parallel_cyclic(struct cache_data *cd_header,
>>>>>>>> */
>>>>>>>> if (!write_cache(cd_page, page_data_buf[index].buf, pd.size))
>>>>>>>> goto out;
>>>>>>>> -
>>>>>>>> + page_data_buf[index].used = FALSE;
>>>>>>>> }
>>>>>>>> -unlock:
>>>>>>>> - pthread_mutex_unlock(&page_data_buf[index].mutex);
>>>>>>>> + info->page_flag_buf[consuming]->ready = FLAG_UNUSED;
>>>>>>>> + info->page_flag_buf[consuming] = info->page_flag_buf[consuming]->next;
>>>>>>>> }
>>>>>>>> -
>>>>>>>> +finish:
>>>>>>>> ret = TRUE;
>>>>>>>> /*
>>>>>>>> * print [100 %]
>>>>>>>> @@ -7463,15 +7532,9 @@ out:
>>>>>>>> }
>>>>>>>> }
>>>>>>>>
>>>>>>>> - if (page_data_buf != NULL) {
>>>>>>>> - for (i = 0; i < page_data_num; i++) {
>>>>>>>> - pthread_mutex_destroy(&page_data_buf[i].mutex);
>>>>>>>> - }
>>>>>>>> - }
>>>>>>>> -
>>>>>>>> + sem_destroy(&info->page_flag_buf_sem);
>>>>>>>> pthread_rwlock_destroy(&info->usemmap_rwlock);
>>>>>>>> pthread_mutex_destroy(&info->filter_mutex);
>>>>>>>> - pthread_mutex_destroy(&info->consumed_pfn_mutex);
>>>>>>>> pthread_mutex_destroy(&info->current_pfn_mutex);
>>>>>>>>
>>>>>>>> return ret;
>>>>>>>> @@ -7564,6 +7627,7 @@ write_kdump_pages_cyclic(struct cache_data *cd_header, struct cache_data *cd_pag
>>>>>>>> num_dumped++;
>>>>>>>> if (!read_pfn(pfn, buf))
>>>>>>>> goto out;
>>>>>>>> +
>>>>>>>> filter_data_buffer(buf, pfn_to_paddr(pfn), info->page_size);
>>>>>>>>
>>>>>>>> /*
>>>>>>>> diff --git a/makedumpfile.h b/makedumpfile.h
>>>>>>>> index e0b5bbf..4b315c0 100644
>>>>>>>> --- a/makedumpfile.h
>>>>>>>> +++ b/makedumpfile.h
>>>>>>>> @@ -44,6 +44,7 @@
>>>>>>>> #include "print_info.h"
>>>>>>>> #include "sadump_mod.h"
>>>>>>>> #include <pthread.h>
>>>>>>>> +#include <semaphore.h>
>>>>>>>>
>>>>>>>> /*
>>>>>>>> * Result of command
>>>>>>>> @@ -977,7 +978,7 @@ typedef unsigned long long int ulonglong;
>>>>>>>> #define PAGE_DATA_NUM (50)
>>>>>>>> #define WAIT_TIME (60 * 10)
>>>>>>>> #define PTHREAD_FAIL ((void *)-2)
>>>>>>>> -#define NUM_BUFFERS (50)
>>>>>>>> +#define NUM_BUFFERS (20)
>>>>>>>>
>>>>>>>> struct mmap_cache {
>>>>>>>> char *mmap_buf;
>>>>>>>> @@ -985,28 +986,33 @@ struct mmap_cache {
>>>>>>>> off_t mmap_end_offset;
>>>>>>>> };
>>>>>>>>
>>>>>>>> +enum {
>>>>>>>> + FLAG_UNUSED,
>>>>>>>> + FLAG_READY,
>>>>>>>> + FLAG_FILLING
>>>>>>>> +};
>>>>>>>> +struct page_flag {
>>>>>>>> + mdf_pfn_t pfn;
>>>>>>>> + char zero;
>>>>>>>> + char ready;
>>>>>>>> + short index;
>>>>>>>> + struct page_flag *next;
>>>>>>>> +};
>>>>>>>> +
>>>>>>>> struct page_data
>>>>>>>> {
>>>>>>>> - mdf_pfn_t pfn;
>>>>>>>> - int dumpable;
>>>>>>>> - int zero;
>>>>>>>> - unsigned int flags;
>>>>>>>> long size;
>>>>>>>> unsigned char *buf;
>>>>>>>> - pthread_mutex_t mutex;
>>>>>>>> - /*
>>>>>>>> - * whether the page_data is ready to be consumed
>>>>>>>> - */
>>>>>>>> - int ready;
>>>>>>>> + int flags;
>>>>>>>> + int used;
>>>>>>>> };
>>>>>>>>
>>>>>>>> struct thread_args {
>>>>>>>> int thread_num;
>>>>>>>> unsigned long len_buf_out;
>>>>>>>> - mdf_pfn_t start_pfn, end_pfn;
>>>>>>>> - int page_data_num;
>>>>>>>> struct cycle *cycle;
>>>>>>>> struct page_data *page_data_buf;
>>>>>>>> + struct page_flag *page_flag_buf;
>>>>>>>> };
>>>>>>>>
>>>>>>>> /*
>>>>>>>> @@ -1295,11 +1301,12 @@ struct DumpInfo {
>>>>>>>> pthread_t **threads;
>>>>>>>> struct thread_args *kdump_thread_args;
>>>>>>>> struct page_data *page_data_buf;
>>>>>>>> + struct page_flag **page_flag_buf;
>>>>>>>> + sem_t page_flag_buf_sem;
>>>>>>>> pthread_rwlock_t usemmap_rwlock;
>>>>>>>> mdf_pfn_t current_pfn;
>>>>>>>> pthread_mutex_t current_pfn_mutex;
>>>>>>>> - mdf_pfn_t consumed_pfn;
>>>>>>>> - pthread_mutex_t consumed_pfn_mutex;
>>>>>>>> + pthread_mutex_t page_data_mutex;
>>>>>>>> pthread_mutex_t filter_mutex;
>>>>>>>> };
>>>>>>>> extern struct DumpInfo *info;
>>>>>>>> --
>>>>>>>> 1.8.3.1
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> _______________________________________________
>>>>>>>> kexec mailing list
>>>>>>>> kexec at lists.infradead.org
>>>>>>>> http://lists.infradead.org/mailman/listinfo/kexec
>>>>>>>
>>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> _______________________________________________
>>>>>> kexec mailing list
>>>>>> kexec at lists.infradead.org
>>>>>> http://lists.infradead.org/mailman/listinfo/kexec
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