Re: Thoughts on TMPFS no longer being considered "highly experimental"

2011/6/23 Alexander V. Chernikov <melifaro_at_ipfw.ru>:
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> Matthew Jacob wrote:
>>
>> I gave up on using it after a brief try earlier this year. I can't
>> remember the details, but it did lock up my amd64 system.
>>
>> On Thu, 23 Jun 2011, David O'Brien wrote:
>>
>>> Does anyone object to this patch?
>>>
>>> David Wolfskill and I have run TMPFS on a number of machines for two
>>> years with no problems.
>>>
>>> I may have missed something, but I'm not aware of any serious PRs on
>>> TMPFS either.
>
> There was some issues with sendfile(2) and mmap(2) causing kernel hangs
> in some cases. vim triggers such hangs for me. However, those problems
> were fixed and MFCed (afair).
>
> I'm using tmpfs on several machines in production without any problems.
> Maybe being _highly_ experimental for nearly 4 years is enough? :)

I think there are still problems with high wired memory consumers like
ZFS. I've got 0-sized tmpfs with 8GB RAM + ZFS with 4GB ARC + 4GB
swap.

>>>
>>>
>>> Index: tmpfs_vfsops.c
>>> ===================================================================
>>> --- tmpfs_vfsops.c    (revision 221113)
>>> +++ tmpfs_vfsops.c    (working copy)
>>> _at__at_ -155,9 +155,6 _at__at_ tmpfs_mount(struct mount *mp)
>>>         return EOPNOTSUPP;
>>>     }
>>>
>>> -    printf("WARNING: TMPFS is considered to be a highly experimental "
>>> -        "feature in FreeBSD.\n");
>>> -
>>>     vn_lock(mp->mnt_vnodecovered, LK_SHARED | LK_RETRY);
>>>     error = VOP_GETATTR(mp->mnt_vnodecovered, &va, mp->mnt_cred);
>>>     VOP_UNLOCK(mp->mnt_vnodecovered, 0);
>>>
>>> --
>>> -- David  (obrien_at_FreeBSD.org)
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