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From: Paul Menzel <pmenzel@molgen.mpg.de>
To: linux-xfs@vger.kernel.org
Subject: xs_ig_attempts ≠ xs_ig_found + xs_ig_missed
Date: Thu, 26 Aug 2021 10:36:41 +0200	[thread overview]
Message-ID: <e9072acd-2daa-96da-f1f2-bca7870d6b55@molgen.mpg.de> (raw)

Dear Linux folks,


In the internal statistics [1] the attempts to look up an inode in the 
inode cache (`xs_ig_attempts`) is a little bigger (35) than the sum of 
found and missed entries minus duplicates (`xfs.inode_ops.ig_dup`): 
651067226 = 651067191 + 35 > 651067191 = 259143798 + 391923706 - 313.

     $ grep ^ig /sys/fs/xfs/sdc/stats/stats # hardware RAID
     ig 651067226 259143798 75 391923706 313 391196609 8760483

For the software RAID device there is no difference: 794085909 = 
293058663 + 501027325 - 79.

     $ grep ^ig /sys/fs/xfs/md0/stats/stats
     ig 794085909 293058663 18555 501027325 79 500997366 320679

Is the first difference expected?


Kind regards,

Paul


[1]: https://xfs.org/index.php/Runtime_Stats#ig

             reply	other threads:[~2021-08-26  8:36 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-26  8:36 Paul Menzel [this message]
2021-08-26 21:17 ` Dave Chinner
2021-08-27  6:22 ` xs_ig_attempts ??? " Christoph Hellwig

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