Re: [zfs-discuss] mdb ::memstat including zfs buffer details?

[Jonathan Adams]

On Nov 8, 2007 4:21 PM, Nathan Kroenert [EMAIL PROTECTED] wrote:

 Hey all -

 Just a quick one...

 Is there any plan to update the mdb ::memstat dcmd to present ZFS
 buffers as part of the summary?

 At present, we get something like:
   ::memstat
 Page SummaryPagesMB  %Tot
      
 Kernel  28859   112   13%
 Anon34230   133   15%
 Exec and libs   10305405%
 Page cache  16876658%
 Free (cachelist)26145   102   12%
 Free (freelist)105176   410   47%
 Balloon 0 00%

 Total  221591   865

 Which just (as far as I can tell) includes the zfs buffers in Kernel
 memory.

 And what I'd really like is:

   ::memstat
 Page SummaryPagesMB  %Tot
      
 Kernel  28859   112   13%
 Anon34230   133   15%
 Exec and libs   10305405%
 Page cache  16876658%
 Free (cachelist)26145   102   12%
 Free (zfscachelist)   1827346  1700   xx%
 Free (freelist)105176   410   47%
 Balloon 0 00%

 Total  221591   865

 Which then represents the pages that *could* be freed up by ZFS in the
 event that they are needed for other purposes...

 Any thoughts on this? Is there a great reason why we cannot do this?

 Also - Other utilities like vmstat, etc that print out memory...


File an RFE.

I don't think it should be too bad (for ::memstat), given that (at least in
Nevada), all of the ZFS caching data belongs to the zvp vnode, instead of
kvp. The work that made that change was:

4894692 caching data in heap inflates crash dump

Of course, this so-called free memory does act a bit differently than the
cachelist, etc., so maybe it should be named slightly differently.

Cheers,
- jonathan
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Re: [zfs-discuss] mdb ::memstat including zfs buffer details?

[johansen]

I don't think it should be too bad (for ::memstat), given that (at
least in Nevada), all of the ZFS caching data belongs to the zvp
vnode, instead of kvp.

ZFS data buffers are attached to zvp; however, we still keep metadata in
the crashdump.  At least right now, this means that cached ZFS metadata
has kvp as its vnode.

-j
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Re: [zfs-discuss] mdb ::memstat including zfs buffer details?

[Jonathan Adams]

On Nov 12, 2007 4:16 PM, [EMAIL PROTECTED] wrote:

 I don't think it should be too bad (for ::memstat), given that (at
 least in Nevada), all of the ZFS caching data belongs to the zvp
 vnode, instead of kvp.

 ZFS data buffers are attached to zvp; however, we still keep metadata in
 the crashdump.  At least right now, this means that cached ZFS metadata
 has kvp as its vnode.


Still, it's better than what you get currently.

Cheers,
- jonathan
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