mmap huge page and MAP_SYNC flag support

Hi,How do I enable the MAP_SYNC flag in mmap for linux 4.15, my code does not compile with that flag on linux 4.15.0-041500rc7-generic #201801072330 Also, how do I make mmap support map size of 2GB or larger, currently the call to mmap fails with mapsize of 2GB. thanks, David

Re: mmap huge page and MAP_SYNC flag support

Thanks Valdis.Looks like the failure is that I can not write to a 2GB buffer (char bf[2GB size]).Where do I get the distro include file? On Thursday, July 12, 2018, 2:58:49 PM EDT, valdis.kletni...@vt.edu wrote: On Thu, 12 Jul 2018 18:44:43 -, David Frank said: > Hi,How d

Re: mmap huge page and MAP_SYNC flag support

, wrote: On Thu, 12 Jul 2018 20:10:36 -, David Frank said: >  Thanks Valdis.Looks like the failure is that I can not write to a 2GB buffer > (char bf[2GB size]).Where do I get the distro include file? >From the same exact place you got the distro kernel from. (I'm guessing

Re: mmap huge page and MAP_SYNC flag support

, David Frank said: >  I got it from hereHow To Install Kernel 4.15 RC7 on Ubuntu, Linux Mint, >Elementary OS And Other Ubuntu Derivatives | LinuxG.net Looks like you got the linux-image-... .deb but didn't do the linux-headers-... .deb(s). (And I have no idea why they list 2 different li

Re: mmap huge page and MAP_SYNC flag support

Thursday, July 12, 2018, 2:58:49 PM EDT, valdis.kletni...@vt.edu wrote: On Thu, 12 Jul 2018 18:44:43 -, David Frank said: > Hi,How do I enable the MAP_SYNC flag in mmap for linux 4.15, my code does not > compile with that flag on linux 4.15.0-041500rc7-generic #201801072330 Get your dis

newly add MAP_SYNC flag to mmap

Hi, I installed LTS 18.04 with headers.  I'm trying to use the new flag MAP_SYNC with mmap call, but it complained MAP_SYNC undefined.What #define do I need to enable this? Thanks, David ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org h

Re: newly add MAP_SYNC flag to mmap

don't have to call msync function, which would boost performance. On Monday, July 16, 2018, 10:04:54 PM EDT, wrote: On Tue, 17 Jul 2018 00:57:31 -0000, David Frank said: > I installed LTS 18.04 with headers.  I'm trying to use the new flag MAP_SYNC > with mmap ca

Re: newly add MAP_SYNC flag to mmap

Right.  That makes sense.  On Monday, July 16, 2018, 7:27:18 PM PDT, valdis.kletni...@vt.edu wrote: On Tue, 17 Jul 2018 02:15:17 -, David Frank said: > inking. I'm checking out if the flag does what is is said to do-- I don't > have > to call msync function

mmap with huge page

Hi,According to the instruction, I have to mount a huge directory to hugetlbfs and create file in the huge directory to use the mmap huge page feature. But the issue is that, the files in the huge directory takes up the huge pages configured throughvm.nr_hugepages = even the files are not used

Re: mmap with huge page

Thanks Mike.  I read the doc, which is not explicit on the non used file taking up huge page count  On Tuesday, July 17, 2018, 4:57:04 PM PDT, Mike Kravetz wrote: On 07/17/2018 12:05 PM, David Frank wrote: > Hi, > According to the instruction, I have to mount a huge direct

memcpy seg fault with mmaped address

Hi, I'm memcpy data into mmaped address with 2GB file, after a few files, it would fault with the following stack dump: received signal SIGSEGV, Segmentation fault.[Switching to Thread 0x75e95700 (LWP 3028)] __memmove_avx_unaligned_erms ()     at ../sysdeps/x86_64/multiarch/memmove-vec-unali