Jonathan T. Looney 54503a13d8 Add a safety net to reclaim mbufs when one of the mbuf zones become ... exhausted. It is possible for a bug in the code (or, theoretically, even unusual network conditions) to exhaust all possible mbufs or mbuf clusters. When this occurs, things can grind to a halt fairly quickly. However, we currently do not call mb_reclaim() unless the entire system is experiencing a low-memory condition. While it is best to try to prevent exhaustion of one of the mbuf zones, it would also be useful to have a mechanism to attempt to recover from these situations by freeing "expendable" mbufs. This patch makes two changes: a) The patch adds a generic API to the UMA zone allocator to set a function that should be called when an allocation fails because the zone limit has been reached. Because of the way this function can be called, it really should do minimal work. b) The patch uses this API to try to free mbufs when an allocation fails from one of the mbuf zones because the zone limit has been reached. The function schedules a callout to run mb_reclaim(). Differential Revision: https://reviews.freebsd.org/D3864 Reviewed by: gnn Comments by: rrs, glebius MFC after: 2 weeks Sponsored by: Juniper Networks		2015-12-20 02:05:33 +00:00
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_vm_radix.h	On all the architectures, avoid to preallocate the physical memory	2013-08-09 11:28:55 +00:00
default_pager.c	A change to KPI of vm_pager_get_pages() and underlying VOP_GETPAGES().	2015-12-16 21:30:45 +00:00
device_pager.c	vm_page_replace: add wrapper to KASSERT about old page	2015-12-17 17:48:57 +00:00
memguard.c	Add comments about CTLFLAG_RDTUN vs. TUNABLE_INT_FETCH.	2015-03-26 05:20:18 +00:00
memguard.h
phys_pager.c	A change to KPI of vm_pager_get_pages() and underlying VOP_GETPAGES().	2015-12-16 21:30:45 +00:00
pmap.h	Properly sort the function declarations added in r286296	2015-08-05 10:48:32 +00:00
redzone.c	Pull in r267961 and r267973 again. Fix for issues reported will follow.	2014-06-28 03:56:17 +00:00
redzone.h
sg_pager.c	vm_page_replace: add wrapper to KASSERT about old page	2015-12-17 17:48:57 +00:00
swap_pager.c	A change to KPI of vm_pager_get_pages() and underlying VOP_GETPAGES().	2015-12-16 21:30:45 +00:00
swap_pager.h
uma_core.c	Add a safety net to reclaim mbufs when one of the mbuf zones become	2015-12-20 02:05:33 +00:00
uma_dbg.c	If INVARIANTS is specified, add ctor/dtor to junk memory if they are	2015-06-25 20:44:46 +00:00
uma_dbg.h
uma_int.h	Add a safety net to reclaim mbufs when one of the mbuf zones become	2015-12-20 02:05:33 +00:00
uma.h	Add a safety net to reclaim mbufs when one of the mbuf zones become	2015-12-20 02:05:33 +00:00
vm_domain.c	Add an initial NUMA affinity/policy configuration for threads and processes.	2015-07-11 15:21:37 +00:00
vm_domain.h	Add an initial NUMA affinity/policy configuration for threads and processes.	2015-07-11 15:21:37 +00:00
vm_extern.h	Add a new file operations hook for mmap operations. File type-specific	2015-06-04 19:41:15 +00:00
vm_fault.c	A change to KPI of vm_pager_get_pages() and underlying VOP_GETPAGES().	2015-12-16 21:30:45 +00:00
vm_glue.c	A change to KPI of vm_pager_get_pages() and underlying VOP_GETPAGES().	2015-12-16 21:30:45 +00:00
vm_init.c	Parallelize the buffer cache and rewrite getnewbuf(). This results in a	2015-10-14 02:10:07 +00:00
vm_kern.c	Introduce a new mechanism for relocating virtual pages to a new physical	2015-12-19 18:42:50 +00:00
vm_kern.h	- Add a statically allocated memguard arena since it is needed very early	2013-08-13 22:40:43 +00:00
vm_map.c	Remove a check which caused spurious SIGSEGV on usermode access to the	2015-09-09 06:19:33 +00:00
vm_map.h	Do not pretend that vm_fault(9) supports unwiring the address. Rename	2015-07-30 18:28:34 +00:00
vm_meter.c	Remove the v_cache_min and v_cache_max sysctls. They are unused and have	2015-09-11 03:00:20 +00:00
vm_mmap.c	Add a local variable initialization needed in the OBJT_DEFAULT case.	2015-07-05 22:26:19 +00:00
vm_object.c	A change to KPI of vm_pager_get_pages() and underlying VOP_GETPAGES().	2015-12-16 21:30:45 +00:00
vm_object.h	A change to KPI of vm_pager_get_pages() and underlying VOP_GETPAGES().	2015-12-16 21:30:45 +00:00
vm_page.c	Introduce a new mechanism for relocating virtual pages to a new physical	2015-12-19 18:42:50 +00:00
vm_page.h	Introduce a new mechanism for relocating virtual pages to a new physical	2015-12-19 18:42:50 +00:00
vm_pageout.c	Introduce a new mechanism for relocating virtual pages to a new physical	2015-12-19 18:42:50 +00:00
vm_pageout.h	Introduce a new mechanism for relocating virtual pages to a new physical	2015-12-19 18:42:50 +00:00
vm_pager.c	A change to KPI of vm_pager_get_pages() and underlying VOP_GETPAGES().	2015-12-16 21:30:45 +00:00
vm_pager.h	A change to KPI of vm_pager_get_pages() and underlying VOP_GETPAGES().	2015-12-16 21:30:45 +00:00
vm_param.h	Remove the v_cache_min and v_cache_max sysctls. They are unused and have	2015-09-11 03:00:20 +00:00
vm_phys.c	Introduce a new mechanism for relocating virtual pages to a new physical	2015-12-19 18:42:50 +00:00
vm_phys.h	Introduce a new mechanism for relocating virtual pages to a new physical	2015-12-19 18:42:50 +00:00
vm_radix.c	Pull in r267961 and r267973 again. Fix for issues reported will follow.	2014-06-28 03:56:17 +00:00
vm_radix.h	Eliminate a redundant parameter to vm_radix_replace().	2013-12-08 20:07:02 +00:00
vm_reserv.c	Introduce a new mechanism for relocating virtual pages to a new physical	2015-12-19 18:42:50 +00:00
vm_reserv.h	Introduce a new mechanism for relocating virtual pages to a new physical	2015-12-19 18:42:50 +00:00
vm_unix.c	Implement lockless resource limits.	2015-06-10 10:48:12 +00:00
vm_zeroidle.c	Pull in r267961 and r267973 again. Fix for issues reported will follow.	2014-06-28 03:56:17 +00:00
vm.h
vnode_pager.c	A change to KPI of vm_pager_get_pages() and underlying VOP_GETPAGES().	2015-12-16 21:30:45 +00:00
vnode_pager.h	A change to KPI of vm_pager_get_pages() and underlying VOP_GETPAGES().	2015-12-16 21:30:45 +00:00