* [dpdk-dev] how does it count the number of contiguous physical pages in map_all_hugepages
@ 2015-01-16 5:32 Jack,Xie Jie
2015-01-16 11:01 ` Bruce Richardson
0 siblings, 1 reply; 2+ messages in thread
From: Jack,Xie Jie @ 2015-01-16 5:32 UTC (permalink / raw)
To: dev
Hi,
I am learning DPDK recently, when I check l2fwd example, I am a little confused, please someone give me a clue.
In function map_all_hugepages called in rte_eal_hugepage_init,
There are lines of source code like below to count the number of contiguous physical pages,
But I check the source code, I just cannot find where is hugepg_tbl[j].physaddr be set before,
how can here check the value of hugepg_tbl[j].physaddr.
/* reserve a virtual area for next contiguous
* physical block: count the number of
* contiguous physical pages. */
for (j = i+1; j < hpi->num_pages[0] ; j++) {
if (hugepg_tbl[j].physaddr !=
hugepg_tbl[j-1].physaddr + hugepage_sz)
break;
}
Thanks !
Jack
^ permalink raw reply [flat|nested] 2+ messages in thread* Re: [dpdk-dev] how does it count the number of contiguous physical pages in map_all_hugepages
2015-01-16 5:32 [dpdk-dev] how does it count the number of contiguous physical pages in map_all_hugepages Jack,Xie Jie
@ 2015-01-16 11:01 ` Bruce Richardson
0 siblings, 0 replies; 2+ messages in thread
From: Bruce Richardson @ 2015-01-16 11:01 UTC (permalink / raw)
To: Jack,Xie Jie; +Cc: dev
On Fri, Jan 16, 2015 at 05:32:08AM +0000, Jack,Xie Jie wrote:
> Hi,
>
> I am learning DPDK recently, when I check l2fwd example, I am a little confused, please someone give me a clue.
>
> In function map_all_hugepages called in rte_eal_hugepage_init,
> There are lines of source code like below to count the number of contiguous physical pages,
> But I check the source code, I just cannot find where is hugepg_tbl[j].physaddr be set before,
> how can here check the value of hugepg_tbl[j].physaddr.
>
> /* reserve a virtual area for next contiguous
> * physical block: count the number of
> * contiguous physical pages. */
> for (j = i+1; j < hpi->num_pages[0] ; j++) {
> if (hugepg_tbl[j].physaddr !=
> hugepg_tbl[j-1].physaddr + hugepage_sz)
> break;
> }
>
>
> Thanks !
> Jack
See function "find_physaddrs" in "eal_memory.c".
Regards,
/Bruce
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2015-01-16 5:32 [dpdk-dev] how does it count the number of contiguous physical pages in map_all_hugepages Jack,Xie Jie
2015-01-16 11:01 ` Bruce Richardson
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