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systemtap
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memory
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mmwriteback.meta
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title: Track Virtual Memory System Writing to Disk name: mmwriteback.stp version: 1.0 author: Red Hat keywords: memory subsystem: memory status: experimental exit: user-controlled output: sorted-list scope: system-wide description: The mmwriteback.stp script uses the virtual memory tracepoints available in some kernels to report all of the file writebacks that occur form kupdate, pdflush and kjournald while the script is running. It's useful in determining where writes are coming from on a supposedly idle system that is experiencing unexpected IO. test_support: (stap -l 'kernel.trace("balance_dirty_pages")' || stap -l 'kernel.trace("mm_balancedirty_writeout")' || stap -l 'kernel.trace("mm_pdflush_bgwriteout")') && (stap -l 'kernel.trace("writeback_pages_written")' || stap -l 'kernel.trace("mm_pdflush_kupdate")') && (stap -l 'kernel.trace("mm_vmscan_writepage")' || stap -l 'kernel.trace("mm_pagereclaim_pgout")') test_check: stap -p4 mmwriteback.stp test_installcheck: stap mmwriteback.stp -T 1