Section 6.14. System Memory Allocation Kstats

6.14. System Memory Allocation Kstats

Use the kstat command to view system memory allocation kstats, as shown below. Table 6.4 describes each statistic.

$ kstat -n system_pages module: unix                        instance: 0 name:   system_pages                class:    pages         availrmem                   97303         crtime                      0         desfree                     1007         desscan                     25         econtig                     4275789824         fastscan                    64455         freemem                     16780         kernelbase                  3556769792         lotsfree                    2014         minfree                     503         nalloc                      1682534446         nalloc_calls                298799         nfree                       1681653744         nfree_calls                 295152         nscan                       0         pagesfree                   16780         pageslocked                 31607         pagestotal                  128910         physmem                     128910         pp_kernel                   32999         slowscan                    100         snaptime                    2415909.89921839 

Table 6.4. Memory Allocation Kstats with unix::system_pages

Statistic	Description	Units	Reference
availrmem	The amount of unlocked pageable memory available for memory allocation.	Pages	9.8[a]
desfree	If free memory falls below desfree, then the page-out scanner is started 100 times/second.	Pages	10.3[a]
desscan	Scan rate target for the page scanner.	Pages/s	10.3[a]
econtig	Address of first block of contiguous kernel memory.	Bytes
fastscan	The rate of pages scanned per second when free memory = 0.	Pages/s	10.3[a]
freemem	System free list size.	Pages	6.4.2
kernelbase	Starting address of kernel mapping.	Bytes
lotsfree	If free memory falls below lotsfree, then the scanner starts stealing anonymous memory pages.	Pages	10.3[a]
minfree	If free memory falls below minfree, then the page scanner is signaled to start every time a new page is created.	Pages	10.3[a]
nalloc	Kernel memory allocator allocations.	Integer
nalloc_calls	Kernel memory allocator calls to alloc().	Integer
nfree	Kernel memory allocator frees.	Integer
nfree_calls	Kernel memory allocator calls to free().	Integer
nscan	Number of pages scanned by the page scanner at last wake-up.	Pages	10.3[a]
pagesfree	System free list size.	Pages	6.4.2
pageslocked	Total number of pages locked into memory by the kernel and user processes.	Pages
pagestotal	Total number of pages available to the system after kernel metamanagement memory.	Pages
physmem	Total number of physical pages in the system at boot.	Pages
pp_kernel	Total number of pages used by the kernel.	Pages
slowscan	The rate of pages scanned per second when free memory = lotsfree.	Pages/s	10.3[a]

^[a] a. Solaris^™ Internals, Second Edition