Ingo Weinhold
3cd2094396
access to a vm_page. It is basically an atomically accessed thread ID field
in the vm_page structure, which is explicitly set by macros marking the
critical sections. As a first positive effect I had to review quite a bit of
code and found several issues.
* Added several TODOs and comments. Some harmless ones, but also a few
troublesome ones in vm.cpp regarding page unmapping.
* file_cache: PrecacheIO::Prepare()/read_into_cache: Removed superfluous
vm_page_allocate_page() return value checks. It cannot fail anymore.
* Removed the heavily contended "pages" lock. We use different policies now:
- sModifiedTemporaryPages is accessed atomically.
- sPageDeficitLock and sFreePageCondition are protected by a new mutex.
- The page queues have individual locks (mutexes).
- Renamed set_page_state_nolock() to set_page_state(). Unless the caller says
otherwise, it does now lock the affected pages queues itself. Also changed
the return value to void -- we panic() anyway.
* set_page_state(): Add free/clear pages to the beginning of their respective
queues as this is more cache-friendly.
* Pages with the states PAGE_STATE_WIRED or PAGE_STATE_UNUSED are no longer
in any queue. They were in the "active" queue, but there's no good reason
to have them there. In case we decide to let the page daemon work the queues
(like FreeBSD) they would just be in the way.
* Pulled the common part of vm_page_allocate_page_run[_no_base]() into a helper
function. Also fixed a bug I introduced previously: The functions must not
vm_page_unreserve_pages() on success, since they remove the pages from the
free/clear queue without decrementing sUnreservedFreePages.
* vm_page_set_state(): Changed return type to void. The function cannot really
fail and no-one was checking it anyway.
* vm_page_free(), vm_page_set_state(): Added assertion: The page must not be
free/clear before. This is implied by the policy that no-one is allowed to
access free/clear pages without holding the respective queue's lock, which is
not the case at this point. This found the bug fixed in r34912.
* vm_page_requeue(): Added general assertions. panic() when requeuing of
free/clear pages is requested. Same reason as above.
* vm_clone_area(), B_FULL_LOCK case: Don't map busy pages. The implementation is
still not correct, though.
My usual -j8 Haiku build test runs another 10% faster, now. The total kernel
time drops about 18%. As hoped the new locks have only a fraction of the old
"pages" lock contention. Other locks lead the "most wanted list" now.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@34933 a95241bf-73f2-0310-859d-f6bbb57e9c96
102 lines
2.7 KiB
C
102 lines
2.7 KiB
C
#ifndef KERNEL_DEBUG_CONFIG_H
|
|
#define KERNEL_DEBUG_CONFIG_H
|
|
|
|
// Master switch:
|
|
// 0: Disables all debug code that hasn't been enabled otherwise.
|
|
// 1: Enables some lightweight debug code.
|
|
// 2: Enables more debug code. Will impact performance.
|
|
#define KDEBUG_LEVEL 2
|
|
|
|
#define KDEBUG_LEVEL_2 (KDEBUG_LEVEL >= 2)
|
|
#define KDEBUG_LEVEL_1 (KDEBUG_LEVEL >= 1)
|
|
#define KDEBUG_LEVEL_0 (KDEBUG_LEVEL >= 0)
|
|
|
|
|
|
// general kernel debugging
|
|
|
|
// Enables kernel ASSERT()s and various checks, locking primitives aren't
|
|
// benaphore-style.
|
|
#define KDEBUG KDEBUG_LEVEL_2
|
|
|
|
// Size of the heap used by the kernel debugger.
|
|
#define KDEBUG_HEAP (64 * 1024)
|
|
|
|
// Set to 0 to disable support for kernel breakpoints.
|
|
#define KERNEL_BREAKPOINTS 1
|
|
|
|
|
|
// block/file cache
|
|
|
|
// Enables debugger commands.
|
|
#define DEBUG_BLOCK_CACHE KDEBUG_LEVEL_1
|
|
|
|
// Enables checks that non-dirty blocks really aren't changed. Seriously
|
|
// degrades performance when the block cache is used heavily.
|
|
#define BLOCK_CACHE_DEBUG_CHANGED KDEBUG_LEVEL_2
|
|
|
|
// Enables a global list of file maps and related debugger commands.
|
|
#define DEBUG_FILE_MAP KDEBUG_LEVEL_1
|
|
|
|
|
|
// heap
|
|
|
|
// Initialize newly allocated memory with something non zero.
|
|
#define PARANOID_KERNEL_MALLOC KDEBUG_LEVEL_2
|
|
|
|
// Check for double free, and fill freed memory with 0xdeadbeef.
|
|
#define PARANOID_KERNEL_FREE KDEBUG_LEVEL_2
|
|
|
|
// Validate sanity of the heap after each operation (slow!).
|
|
#define PARANOID_HEAP_VALIDATION 0
|
|
|
|
// Store size, thread and team info at the end of each allocation block.
|
|
// Enables the "allocations*" debugger commands.
|
|
#define KERNEL_HEAP_LEAK_CHECK 0
|
|
|
|
|
|
// interrupts
|
|
|
|
// Adds statistics and unhandled counter per interrupts. Enables the "ints"
|
|
// debugger command.
|
|
#define DEBUG_INTERRUPTS KDEBUG_LEVEL_1
|
|
|
|
|
|
// semaphores
|
|
|
|
// Enables tracking of the last threads that acquired/released a semaphore.
|
|
#define DEBUG_SEM_LAST_ACQUIRER KDEBUG_LEVEL_1
|
|
|
|
|
|
// SMP
|
|
|
|
// Enables spinlock caller debugging. When acquiring a spinlock twice on a
|
|
// non-SMP machine, this will give a clue who locked it the first time.
|
|
// Furthermore (also on SMP machines) the "spinlock" debugger command will be
|
|
// available.
|
|
#define DEBUG_SPINLOCKS KDEBUG_LEVEL_2
|
|
|
|
#define DEBUG_SPINLOCK_LATENCIES 0
|
|
|
|
|
|
// VM
|
|
|
|
// Enables the vm_page::queue field, i.e. it is tracked which queue the page
|
|
// should be in.
|
|
#define DEBUG_PAGE_QUEUE 0
|
|
|
|
// Enables the vm_page::access_count field, which is used to detect invalid
|
|
// concurrent access to the page.
|
|
#define DEBUG_PAGE_ACCESS 1
|
|
|
|
// Enables a global list of all vm_cache structures.
|
|
#define DEBUG_CACHE_LIST KDEBUG_LEVEL_1
|
|
|
|
// Enables swap support.
|
|
#define ENABLE_SWAP_SUPPORT 1
|
|
|
|
// When set limits the amount of available RAM (in MB).
|
|
//#define LIMIT_AVAILABLE_MEMORY 256
|
|
|
|
|
|
#endif // KERNEL_DEBUG_CONFIG_H
|