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267654 |
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19-Jun-2014 |
gjb |
Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.
Approved by: re (implicit) Sponsored by: The FreeBSD Foundation |
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262933 |
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08-Mar-2014 |
dumbbell |
MFC vm_page_alloc_contig()
This function will be used by TTM, a memory manager used by the Radeon KMS driver.
Compared to HEAD, the type of the "boundary" argument to several functions is left as "unsigned long" (instead of "vm_paddr_t" in HEAD) to prevent an API change in a stable branch.
The following revisions were merged in this single commit:
MFC r226928: Eliminate vm_phys_bootstrap_alloc(). It was a failed attempt at eliminating duplicated code in the various pmap implementations.
Micro-optimize vm_phys_free_pages().
Introduce vm_phys_free_contig(). It is fast routine for freeing an arbitrary number of physically contiguous pages. In particular, it doesn't require the number of pages to be a power of two.
Use "u_long" instead of "unsigned long".
Bruce Evans (bde@) has convinced me that the "boundary" parameters to kmem_alloc_contig(), vm_phys_alloc_contig(), and vm_reserv_reclaim_contig() should be of type "vm_paddr_t" and not "u_long". Make this change.
MFC r227012: Add support for VM_ALLOC_WIRED and VM_ALLOC_ZERO to vm_page_alloc_freelist() and use these new options in the mips pmap.
Wake up the page daemon in vm_page_alloc_freelist() if the number of free and cached pages becomes too low.
Tidy up vm_page_alloc_init(). In particular, add a comment about an important restriction on its use.
Tested by: jchandra@
MFC r227072: Simplify the implementation of the failure case in kmem_alloc_attr().
MFC r227127: Wake up the page daemon in vm_page_alloc_freelist() if it couldn't allocate the requested page because too few pages are cached or free.
Document the VM_ALLOC_COUNT() option to vm_page_alloc() and vm_page_alloc_freelist().
Make style changes to vm_page_alloc() and vm_page_alloc_freelist(), such as using a variable name that more closely corresponds to the comments.
MFC r227568: Refactor the code that performs physically contiguous memory allocation, yielding a new public interface, vm_page_alloc_contig(). This new function addresses some of the limitations of the current interfaces, contigmalloc() and kmem_alloc_contig(). For example, the physically contiguous memory that is allocated with those interfaces can only be allocated to the kernel vm object and must be mapped into the kernel virtual address space. It also provides functionality that vm_phys_alloc_contig() doesn't, such as wiring the returned pages. Moreover, unlike that function, it respects the low water marks on the paging queues and wakes up the page daemon when necessary. That said, at present, this new function can't be applied to all types of vm objects. However, that restriction will be eliminated in the coming weeks.
From a design standpoint, this change also addresses an inconsistency between vm_phys_alloc_contig() and the other vm_phys_alloc*() functions. Specifically, vm_phys_alloc_contig() manipulated vm_page fields that other functions in vm/vm_phys.c didn't. Moreover, vm_phys_alloc_contig() knew about vnodes and reservations. Now, vm_page_alloc_contig() is responsible for these things.
Reviewed by: kib Discussed with: jhb
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234771 |
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28-Apr-2012 |
alc |
MFC r234038 If a page belonging a reservation is cached, then mark the reservation so that it will be freed to the cache pool rather than the default pool. Otherwise, the cached pages within the reservation may be recycled sooner than necessary.
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225736 |
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22-Sep-2011 |
kensmith |
Copy head to stable/9 as part of 9.0-RELEASE release cycle.
Approved by: re (implicit)
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217916 |
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26-Jan-2011 |
mdf |
Explicitly wire the user buffer rather than doing it implicitly in sbuf_new_for_sysctl(9). This allows using an sbuf with a SYSCTL_OUT drain for extremely large amounts of data where the caller knows that appropriate references are held, and sleeping is not an issue.
Inspired by: rwatson
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215508 |
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19-Nov-2010 |
mlaier |
Off by one page in vm_reserv_reclaim_contig(): Also reclaim reservations with only a single free page if that satisfies the requested size.
MFC after: 3 days Reviewed by: alc
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215093 |
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10-Nov-2010 |
alc |
Enable reservation-based physical memory allocation. Even without the creation of large page mappings in the pmap, it can provide modest performance benefits. In particular, for a "buildworld" on a 2x 1GHz Ultrasparc IIIi it reduced the wall clock time by 2.2% and the system time by 12.6%.
Tested by: marius@
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214564 |
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30-Oct-2010 |
alc |
Correct some format strings used by sysctls.
MFC after: 1 week
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212750 |
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16-Sep-2010 |
mdf |
Re-add r212370 now that the LOR in powerpc64 has been resolved:
Add a drain function for struct sysctl_req, and use it for a variety of handlers, some of which had to do awkward things to get a large enough SBUF_FIXEDLEN buffer.
Note that some sysctl handlers were explicitly outputting a trailing NUL byte. This behaviour was preserved, though it should not be necessary.
Reviewed by: phk (original patch)
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212572 |
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13-Sep-2010 |
mdf |
Revert r212370, as it causes a LOR on powerpc. powerpc does a few unexpected things in copyout(9) and so wiring the user buffer is not sufficient to perform a copyout(9) while holding a random mutex.
Requested by: nwhitehorn
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212370 |
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09-Sep-2010 |
mdf |
Add a drain function for struct sysctl_req, and use it for a variety of handlers, some of which had to do awkward things to get a large enough FIXEDLEN buffer.
Note that some sysctl handlers were explicitly outputting a trailing NUL byte. This behaviour was preserved, though it should not be necessary.
Reviewed by: phk
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190912 |
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11-Apr-2009 |
alc |
Previously, when vm_page_free_toq() was performed on a page belonging to a reservation, unless all of the reservation's pages were free, the reservation was moved to the head of the partially-populated reservations queue, where it would be the next reservation to be broken in case the free page queues were emptied. Now, instead, I am moving it to the tail. Very likely this reservation is in the process of being freed in its entirety, so placing it at the tail of the queue makes it more likely that the underlying physical memory will be returned to the free page queues as one contiguous chunk. If a reservation must be broken, it will, instead, be the longest unchanged reservation, which is arguably the reservation that is least likely to ever achieve promotion or be freed in its entirety.
MFC after: 6 weeks
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177956 |
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06-Apr-2008 |
alc |
Introduce vm_reserv_reclaim_contig(). This function is used by contigmalloc(9) as a last resort to steal pages from an inactive, partially-used superpage reservation.
Rename vm_reserv_reclaim() to vm_reserv_reclaim_inactive() and refactor it so that a separate subroutine is responsible for breaking the selected reservation. This subroutine is also used by vm_reserv_reclaim_contig().
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174982 |
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29-Dec-2007 |
alc |
Add the superpage reservation system. This is "part 2 of 2" of the machine-independent support for superpages. (The earlier part was the rewrite of the physical memory allocator.) The remainder of the code required for superpages support is machine-dependent and will be added to the various pmap implementations at a later date.
Initially, I am only supporting one large page size per architecture. Moreover, I am only enabling the reservation system on amd64. (In an emergency, it can be disabled by setting VM_NRESERVLEVELS to 0 in amd64/include/vmparam.h or your kernel configuration file.)
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