#
36ec807b |
| 20-Sep-2024 |
Dmitry Torokhov <dmitry.torokhov@gmail.com> |
Merge branch 'next' into for-linus
Prepare input updates for 6.12 merge window.
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Revision tags: v6.11, v6.11-rc7 |
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#
f057b572 |
| 06-Sep-2024 |
Dmitry Torokhov <dmitry.torokhov@gmail.com> |
Merge branch 'ib/6.11-rc6-matrix-keypad-spitz' into next
Bring in changes removing support for platform data from matrix-keypad driver.
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Revision tags: v6.11-rc6, v6.11-rc5, v6.11-rc4, v6.11-rc3, v6.11-rc2, v6.11-rc1 |
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#
3daee2e4 |
| 16-Jul-2024 |
Dmitry Torokhov <dmitry.torokhov@gmail.com> |
Merge tag 'v6.10' into next
Sync up with mainline to bring in device_for_each_child_node_scoped() and other newer APIs.
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#
66e72a01 |
| 29-Jul-2024 |
Jerome Brunet <jbrunet@baylibre.com> |
Merge tag 'v6.11-rc1' into clk-meson-next
Linux 6.11-rc1
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#
ee057c8c |
| 14-Aug-2024 |
Steven Rostedt <rostedt@goodmis.org> |
Merge tag 'v6.11-rc3' into trace/ring-buffer/core
The "reserve_mem" kernel command line parameter has been pulled into v6.11. Merge the latest -rc3 to allow the persistent ring buffer memory to be a
Merge tag 'v6.11-rc3' into trace/ring-buffer/core
The "reserve_mem" kernel command line parameter has been pulled into v6.11. Merge the latest -rc3 to allow the persistent ring buffer memory to be able to be mapped at the address specified by the "reserve_mem" command line parameter.
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
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#
617a814f |
| 21-Sep-2024 |
Linus Torvalds <torvalds@linux-foundation.org> |
Merge tag 'mm-stable-2024-09-20-02-31' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Pull MM updates from Andrew Morton: "Along with the usual shower of singleton patches, notable patch
Merge tag 'mm-stable-2024-09-20-02-31' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Pull MM updates from Andrew Morton: "Along with the usual shower of singleton patches, notable patch series in this pull request are:
- "Align kvrealloc() with krealloc()" from Danilo Krummrich. Adds consistency to the APIs and behaviour of these two core allocation functions. This also simplifies/enables Rustification.
- "Some cleanups for shmem" from Baolin Wang. No functional changes - mode code reuse, better function naming, logic simplifications.
- "mm: some small page fault cleanups" from Josef Bacik. No functional changes - code cleanups only.
- "Various memory tiering fixes" from Zi Yan. A small fix and a little cleanup.
- "mm/swap: remove boilerplate" from Yu Zhao. Code cleanups and simplifications and .text shrinkage.
- "Kernel stack usage histogram" from Pasha Tatashin and Shakeel Butt. This is a feature, it adds new feilds to /proc/vmstat such as
$ grep kstack /proc/vmstat kstack_1k 3 kstack_2k 188 kstack_4k 11391 kstack_8k 243 kstack_16k 0
which tells us that 11391 processes used 4k of stack while none at all used 16k. Useful for some system tuning things, but partivularly useful for "the dynamic kernel stack project".
- "kmemleak: support for percpu memory leak detect" from Pavel Tikhomirov. Teaches kmemleak to detect leaksage of percpu memory.
- "mm: memcg: page counters optimizations" from Roman Gushchin. "3 independent small optimizations of page counters".
- "mm: split PTE/PMD PT table Kconfig cleanups+clarifications" from David Hildenbrand. Improves PTE/PMD splitlock detection, makes powerpc/8xx work correctly by design rather than by accident.
- "mm: remove arch_make_page_accessible()" from David Hildenbrand. Some folio conversions which make arch_make_page_accessible() unneeded.
- "mm, memcg: cg2 memory{.swap,}.peak write handlers" fro David Finkel. Cleans up and fixes our handling of the resetting of the cgroup/process peak-memory-use detector.
- "Make core VMA operations internal and testable" from Lorenzo Stoakes. Rationalizaion and encapsulation of the VMA manipulation APIs. With a view to better enable testing of the VMA functions, even from a userspace-only harness.
- "mm: zswap: fixes for global shrinker" from Takero Funaki. Fix issues in the zswap global shrinker, resulting in improved performance.
- "mm: print the promo watermark in zoneinfo" from Kaiyang Zhao. Fill in some missing info in /proc/zoneinfo.
- "mm: replace follow_page() by folio_walk" from David Hildenbrand. Code cleanups and rationalizations (conversion to folio_walk()) resulting in the removal of follow_page().
- "improving dynamic zswap shrinker protection scheme" from Nhat Pham. Some tuning to improve zswap's dynamic shrinker. Significant reductions in swapin and improvements in performance are shown.
- "mm: Fix several issues with unaccepted memory" from Kirill Shutemov. Improvements to the new unaccepted memory feature,
- "mm/mprotect: Fix dax puds" from Peter Xu. Implements mprotect on DAX PUDs. This was missing, although nobody seems to have notied yet.
- "Introduce a store type enum for the Maple tree" from Sidhartha Kumar. Cleanups and modest performance improvements for the maple tree library code.
- "memcg: further decouple v1 code from v2" from Shakeel Butt. Move more cgroup v1 remnants away from the v2 memcg code.
- "memcg: initiate deprecation of v1 features" from Shakeel Butt. Adds various warnings telling users that memcg v1 features are deprecated.
- "mm: swap: mTHP swap allocator base on swap cluster order" from Chris Li. Greatly improves the success rate of the mTHP swap allocation.
- "mm: introduce numa_memblks" from Mike Rapoport. Moves various disparate per-arch implementations of numa_memblk code into generic code.
- "mm: batch free swaps for zap_pte_range()" from Barry Song. Greatly improves the performance of munmap() of swap-filled ptes.
- "support large folio swap-out and swap-in for shmem" from Baolin Wang. With this series we no longer split shmem large folios into simgle-page folios when swapping out shmem.
- "mm/hugetlb: alloc/free gigantic folios" from Yu Zhao. Nice performance improvements and code reductions for gigantic folios.
- "support shmem mTHP collapse" from Baolin Wang. Adds support for khugepaged's collapsing of shmem mTHP folios.
- "mm: Optimize mseal checks" from Pedro Falcato. Fixes an mprotect() performance regression due to the addition of mseal().
- "Increase the number of bits available in page_type" from Matthew Wilcox. Increases the number of bits available in page_type!
- "Simplify the page flags a little" from Matthew Wilcox. Many legacy page flags are now folio flags, so the page-based flags and their accessors/mutators can be removed.
- "mm: store zero pages to be swapped out in a bitmap" from Usama Arif. An optimization which permits us to avoid writing/reading zero-filled zswap pages to backing store.
- "Avoid MAP_FIXED gap exposure" from Liam Howlett. Fixes a race window which occurs when a MAP_FIXED operqtion is occurring during an unrelated vma tree walk.
- "mm: remove vma_merge()" from Lorenzo Stoakes. Major rotorooting of the vma_merge() functionality, making ot cleaner, more testable and better tested.
- "misc fixups for DAMON {self,kunit} tests" from SeongJae Park. Minor fixups of DAMON selftests and kunit tests.
- "mm: memory_hotplug: improve do_migrate_range()" from Kefeng Wang. Code cleanups and folio conversions.
- "Shmem mTHP controls and stats improvements" from Ryan Roberts. Cleanups for shmem controls and stats.
- "mm: count the number of anonymous THPs per size" from Barry Song. Expose additional anon THP stats to userspace for improved tuning.
- "mm: finish isolate/putback_lru_page()" from Kefeng Wang: more folio conversions and removal of now-unused page-based APIs.
- "replace per-quota region priorities histogram buffer with per-context one" from SeongJae Park. DAMON histogram rationalization.
- "Docs/damon: update GitHub repo URLs and maintainer-profile" from SeongJae Park. DAMON documentation updates.
- "mm/vdpa: correct misuse of non-direct-reclaim __GFP_NOFAIL and improve related doc and warn" from Jason Wang: fixes usage of page allocator __GFP_NOFAIL and GFP_ATOMIC flags.
- "mm: split underused THPs" from Yu Zhao. Improve THP=always policy. This was overprovisioning THPs in sparsely accessed memory areas.
- "zram: introduce custom comp backends API" frm Sergey Senozhatsky. Add support for zram run-time compression algorithm tuning.
- "mm: Care about shadow stack guard gap when getting an unmapped area" from Mark Brown. Fix up the various arch_get_unmapped_area() implementations to better respect guard areas.
- "Improve mem_cgroup_iter()" from Kinsey Ho. Improve the reliability of mem_cgroup_iter() and various code cleanups.
- "mm: Support huge pfnmaps" from Peter Xu. Extends the usage of huge pfnmap support.
- "resource: Fix region_intersects() vs add_memory_driver_managed()" from Huang Ying. Fix a bug in region_intersects() for systems with CXL memory.
- "mm: hwpoison: two more poison recovery" from Kefeng Wang. Teaches a couple more code paths to correctly recover from the encountering of poisoned memry.
- "mm: enable large folios swap-in support" from Barry Song. Support the swapin of mTHP memory into appropriately-sized folios, rather than into single-page folios"
* tag 'mm-stable-2024-09-20-02-31' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (416 commits) zram: free secondary algorithms names uprobes: turn xol_area->pages[2] into xol_area->page uprobes: introduce the global struct vm_special_mapping xol_mapping Revert "uprobes: use vm_special_mapping close() functionality" mm: support large folios swap-in for sync io devices mm: add nr argument in mem_cgroup_swapin_uncharge_swap() helper to support large folios mm: fix swap_read_folio_zeromap() for large folios with partial zeromap mm/debug_vm_pgtable: Use pxdp_get() for accessing page table entries set_memory: add __must_check to generic stubs mm/vma: return the exact errno in vms_gather_munmap_vmas() memcg: cleanup with !CONFIG_MEMCG_V1 mm/show_mem.c: report alloc tags in human readable units mm: support poison recovery from copy_present_page() mm: support poison recovery from do_cow_fault() resource, kunit: add test case for region_intersects() resource: make alloc_free_mem_region() works for iomem_resource mm: z3fold: deprecate CONFIG_Z3FOLD vfio/pci: implement huge_fault support mm/arm64: support large pfn mappings mm/x86: support large pfn mappings ...
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#
590b9d57 |
| 22-Jul-2024 |
Danilo Krummrich <dakr@kernel.org> |
mm: kvmalloc: align kvrealloc() with krealloc()
Besides the obvious (and desired) difference between krealloc() and kvrealloc(), there is some inconsistency in their function signatures and behavior
mm: kvmalloc: align kvrealloc() with krealloc()
Besides the obvious (and desired) difference between krealloc() and kvrealloc(), there is some inconsistency in their function signatures and behavior:
- krealloc() frees the memory when the requested size is zero, whereas kvrealloc() simply returns a pointer to the existing allocation.
- krealloc() behaves like kmalloc() if a NULL pointer is passed, whereas kvrealloc() does not accept a NULL pointer at all and, if passed, would fault instead.
- krealloc() is self-contained, whereas kvrealloc() relies on the caller to provide the size of the previous allocation.
Inconsistent behavior throughout allocation APIs is error prone, hence make kvrealloc() behave like krealloc(), which seems superior in all mentioned aspects.
Besides that, implementing kvrealloc() by making use of krealloc() and vrealloc() provides oppertunities to grow (and shrink) allocations more efficiently. For instance, vrealloc() can be optimized to allocate and map additional pages to grow the allocation or unmap and free unused pages to shrink the allocation.
[dakr@kernel.org: document concurrency restrictions] Link: https://lkml.kernel.org/r/20240725125442.4957-1-dakr@kernel.org [dakr@kernel.org: disable KASAN when switching to vmalloc] Link: https://lkml.kernel.org/r/20240730185049.6244-2-dakr@kernel.org [dakr@kernel.org: properly document __GFP_ZERO behavior] Link: https://lkml.kernel.org/r/20240730185049.6244-5-dakr@kernel.org Link: https://lkml.kernel.org/r/20240722163111.4766-3-dakr@kernel.org Signed-off-by: Danilo Krummrich <dakr@kernel.org> Acked-by: Michal Hocko <mhocko@suse.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> Cc: Chandan Babu R <chandan.babu@oracle.com> Cc: Christian König <christian.koenig@amd.com> Cc: Christoph Hellwig <hch@infradead.org> Cc: Christoph Lameter <cl@linux.com> Cc: David Rientjes <rientjes@google.com> Cc: Hyeonggon Yoo <42.hyeyoo@gmail.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Kees Cook <kees@kernel.org> Cc: Marc Zyngier <maz@kernel.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Miguel Ojeda <ojeda@kernel.org> Cc: Oliver Upton <oliver.upton@linux.dev> Cc: Pekka Enberg <penberg@kernel.org> Cc: Roman Gushchin <roman.gushchin@linux.dev> Cc: Uladzislau Rezki <urezki@gmail.com> Cc: Wedson Almeida Filho <wedsonaf@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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#
c8faf11c |
| 30-Jul-2024 |
Tejun Heo <tj@kernel.org> |
Merge tag 'v6.11-rc1' into for-6.12
Linux 6.11-rc1
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#
8751b21a |
| 19-Sep-2024 |
Linus Torvalds <torvalds@linux-foundation.org> |
Merge tag 'xfs-6.12-merge-1' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux
Pull xfs updates from Chandan Babu: "New code:
- Introduce new ioctls to exchange contents of two files.
The
Merge tag 'xfs-6.12-merge-1' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux
Pull xfs updates from Chandan Babu: "New code:
- Introduce new ioctls to exchange contents of two files.
The first ioctl does the preparation work to exchange the contents of two files while the second ioctl performs the actual exchange if the target file has not been changed since a given sampling point.
Fixes:
- Fix bugs associated with calculating the maximum range of realtime extents to scan for free space.
- Copy keys instead of records when resizing the incore BMBT root block.
- Do not report FITRIMming more bytes than possibly exist in the filesystem.
- Modify xfs_fs.h to prevent C++ compilation errors.
- Do not over eagerly free post-EOF speculative preallocation.
- Ensure st_blocks never goes to zero during COW writes
Cleanups/refactors:
- Use Xarray to hold per-AG data instead of a Radix tree.
- Cleanups to: - realtime bitmap - inode allocator - quota - inode rooted btree code"
* tag 'xfs-6.12-merge-1' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux: (61 commits) xfs: ensure st_blocks never goes to zero during COW writes xfs: use xas_for_each_marked in xfs_reclaim_inodes_count xfs: convert perag lookup to xarray xfs: simplify tagged perag iteration xfs: move the tagged perag lookup helpers to xfs_icache.c xfs: use kfree_rcu_mightsleep to free the perag structures xfs: use LIST_HEAD() to simplify code xfs: Remove duplicate xfs_trans_priv.h header xfs: remove unnecessary check xfs: Use xfs set and clear mp state helpers xfs: reclaim speculative preallocations for append only files xfs: simplify extent lookup in xfs_can_free_eofblocks xfs: check XFS_EOFBLOCKS_RELEASED earlier in xfs_release_eofblocks xfs: only free posteof blocks on first close xfs: don't free post-EOF blocks on read close xfs: skip all of xfs_file_release when shut down xfs: don't bother returning errors from xfs_file_release xfs: refactor f_op->release handling xfs: remove the i_mode check in xfs_release xfs: standardize the btree maxrecs function parameters ...
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Revision tags: v6.10 |
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#
ca57120d |
| 10-Jul-2024 |
John Garry <john.g.garry@oracle.com> |
xfs: Use xfs set and clear mp state helpers
Use the set and clear mp state helpers instead of open-coding.
It is noted that in some instances calls to atomic operation set_bit() and clear_bit() are
xfs: Use xfs set and clear mp state helpers
Use the set and clear mp state helpers instead of open-coding.
It is noted that in some instances calls to atomic operation set_bit() and clear_bit() are being replaced with test_and_set_bit() and test_and_clear_bit(), respectively, as there is no specific helpers for set_bit() and clear_bit() only. However should be ok, as we are just ignoring the returned value from those "test" variants.
Signed-off-by: John Garry <john.g.garry@oracle.com> Reviewed-by: Darrick J. Wong <djwong@kernel.org> Reviewed-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com> Signed-off-by: Chandan Babu R <chandanbabu@kernel.org>
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#
ed7171ff |
| 16-Aug-2024 |
Lucas De Marchi <lucas.demarchi@intel.com> |
Merge drm/drm-next into drm-xe-next
Get drm-xe-next on v6.11-rc2 and synchronized with drm-intel-next for the display side. This resolves the current conflict for the enable_display module parameter
Merge drm/drm-next into drm-xe-next
Get drm-xe-next on v6.11-rc2 and synchronized with drm-intel-next for the display side. This resolves the current conflict for the enable_display module parameter and allows further pending refactors.
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
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#
5c61f598 |
| 12-Aug-2024 |
Thomas Zimmermann <tzimmermann@suse.de> |
Merge drm/drm-next into drm-misc-next
Get drm-misc-next to the state of v6.11-rc2.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
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#
3663e2c4 |
| 01-Aug-2024 |
Jani Nikula <jani.nikula@intel.com> |
Merge drm/drm-next into drm-intel-next
Sync with v6.11-rc1 in general, and specifically get the new BACKLIGHT_POWER_ constants for power states.
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
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#
4436e6da |
| 02-Aug-2024 |
Thomas Gleixner <tglx@linutronix.de> |
Merge branch 'linus' into x86/mm
Bring x86 and selftests up to date
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a1ff5a7d |
| 30-Jul-2024 |
Maxime Ripard <mripard@kernel.org> |
Merge drm/drm-fixes into drm-misc-fixes
Let's start the new drm-misc-fixes cycle by bringing in 6.11-rc1.
Signed-off-by: Maxime Ripard <mripard@kernel.org>
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a23e1966 |
| 15-Jul-2024 |
Dmitry Torokhov <dmitry.torokhov@gmail.com> |
Merge branch 'next' into for-linus
Prepare input updates for 6.11 merge window.
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Revision tags: v6.10-rc7, v6.10-rc6, v6.10-rc5, v6.10-rc4, v6.10-rc3, v6.10-rc2 |
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6f47c7ae |
| 28-May-2024 |
Dmitry Torokhov <dmitry.torokhov@gmail.com> |
Merge tag 'v6.9' into next
Sync up with the mainline to bring in the new cleanup API.
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#
afeea275 |
| 04-Jul-2024 |
Maxime Ripard <mripard@kernel.org> |
Merge drm-misc-next-2024-07-04 into drm-misc-next-fixes
Let's start the drm-misc-next-fixes cycle.
Signed-off-by: Maxime Ripard <mripard@kernel.org>
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#
d754ed28 |
| 19-Jun-2024 |
Jani Nikula <jani.nikula@intel.com> |
Merge drm/drm-next into drm-intel-next
Sync to v6.10-rc3.
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
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#
89aa02ed |
| 12-Jun-2024 |
Rodrigo Vivi <rodrigo.vivi@intel.com> |
Merge drm/drm-next into drm-xe-next
Needed to get tracing cleanup and add mmio tracing series.
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
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92815da4 |
| 12-Jun-2024 |
Dmitry Baryshkov <dmitry.baryshkov@linaro.org> |
Merge remote-tracking branch 'drm-misc/drm-misc-next' into HEAD
Merge drm-misc-next tree into the msm-next tree in order to be able to use HDMI connector framework for the MSM HDMI driver.
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#
375c4d15 |
| 27-May-2024 |
Maxime Ripard <mripard@kernel.org> |
Merge drm/drm-next into drm-misc-next
Let's start the new release cycle.
Signed-off-by: Maxime Ripard <mripard@kernel.org>
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Revision tags: v6.10-rc1 |
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60a2f25d |
| 16-May-2024 |
Tvrtko Ursulin <tursulin@ursulin.net> |
Merge drm/drm-next into drm-intel-gt-next
Some display refactoring patches are needed in order to allow conflict- less merging.
Signed-off-by: Tvrtko Ursulin <tursulin@ursulin.net>
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bf3aa9de |
| 17-Jul-2024 |
Linus Torvalds <torvalds@linux-foundation.org> |
Merge tag 'xfs-6.11-merge-3' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux
Pull xfs updates from Chandan Babu: "Major changes in this release are limited to enabling FITRIM on realtime devices
Merge tag 'xfs-6.11-merge-3' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux
Pull xfs updates from Chandan Babu: "Major changes in this release are limited to enabling FITRIM on realtime devices and Byte-based grant head log reservation tracking.
The remaining changes are limited to fixes and cleanups included in this pull request.
Core:
- Enable FITRIM on the realtime device
- Introduce byte-based grant head log reservation tracking instead of physical log location tracking.
This allows grant head to track a full 64 bit bytes space and hence overcome the limit of 4GB indexing that has been present until now
Fixes:
- xfs_flush_unmap_range() and xfs_prepare_shift() should consider RT extents in the flush unmap range
- Implement bounds check when traversing log operations during log replay
- Prevent out of bounds access when traversing a directory data block
- Prevent incorrect ENOSPC when concurrently performing file creation and file writes
- Fix rtalloc rotoring when delalloc is in use
Cleanups:
- Clean up I/O path inode locking helpers and the page fault handler
- xfs: hoist inode operations to libxfs in anticipation of the metadata inode directory feature, which maintains a directory tree of metadata inodes. This will be necessary for further enhancements to the realtime feature, subvolume support
- Clean up some warts in the extent freeing log intent code
- Clean up the refcount and rmap intent code before adding support for realtime devices
- Provide the correct email address for sysfs ABI documentation"
* tag 'xfs-6.11-merge-3' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux: (80 commits) xfs: fix rtalloc rotoring when delalloc is in use xfs: get rid of xfs_ag_resv_rmapbt_alloc xfs: skip flushing log items during push xfs: grant heads track byte counts, not LSNs xfs: pass the full grant head to accounting functions xfs: track log space pinned by the AIL xfs: collapse xlog_state_set_callback in caller xfs: l_last_sync_lsn is really AIL state xfs: ensure log tail is always up to date xfs: background AIL push should target physical space xfs: AIL doesn't need manual pushing xfs: move and rename xfs_trans_committed_bulk xfs: fix the contact address for the sysfs ABI documentation xfs: Avoid races with cnt_btree lastrec updates xfs: move xfs_refcount_update_defer_add to xfs_refcount_item.c xfs: simplify usage of the rcur local variable in xfs_refcount_finish_one xfs: don't bother calling xfs_refcount_finish_one_cleanup in xfs_refcount_finish_one xfs: reuse xfs_refcount_update_cancel_item xfs: add a ci_entry helper xfs: remove xfs_trans_set_refcount_flags ...
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#
c1220522 |
| 20-Jun-2024 |
Dave Chinner <dchinner@redhat.com> |
xfs: grant heads track byte counts, not LSNs
The grant heads in the log track the space reserved in the log for running transactions. They do this by tracking how far ahead of the tail that the rese
xfs: grant heads track byte counts, not LSNs
The grant heads in the log track the space reserved in the log for running transactions. They do this by tracking how far ahead of the tail that the reservation has reached, and the units for doing this are {cycle,bytes} for the reserve head rather than {cycle,blocks} which are normal used by LSNs.
This is annoyingly complex because we have to split, crack and combined these tuples for any calculation we do to determine log space and targets. This is computationally expensive as well as difficult to do atomically and locklessly, as well as limiting the size of the log to 2^32 bytes.
Really, though, all the grant heads are tracking is how much space is currently available for use in the log. We can track this as a simply byte count - we just don't care what the actual physical location in the log the head and tail are at, just how much space we have remaining before the head and tail overlap.
So, convert the grant heads to track the byte reservations that are active rather than the current (cycle, offset) tuples. This means an empty log has zero bytes consumed, and a full log is when the reservations reach the size of the log minus the space consumed by the AIL.
This greatly simplifies the accounting and checks for whether there is space available. We no longer need to crack or combine LSNs to determine how much space the log has left, nor do we need to look at the head or tail of the log to determine how close to full we are.
There is, however, a complexity that needs to be handled. We know how much space is being tracked in the AIL now via log->l_tail_space and the log tickets track active reservations and return the unused portions to the grant heads when ungranted. Unfortunately, we don't track the used portion of the grant, so when we transfer log items from the CIL to the AIL, the space accounted to the grant heads is transferred to the log tail space. Hence when we move the AIL head forwards on item insert, we have to remove that space from the grant heads.
We also remove the xlog_verify_grant_tail() debug function as it is no longer useful. The check it performs has been racy since delayed logging was introduced, but now it is clearly only detecting false positives so remove it.
The result of this substantially simpler accounting algorithm is an increase in sustained transaction rate from ~1.3 million transactions/s to ~1.9 million transactions/s with no increase in CPU usage. We also remove the 32 bit space limitation on the grant heads, which will allow us to increase the journal size beyond 2GB in future.
Note that this renames the sysfs files exposing the log grant space now that the values are exported in bytes. This allows xfstests to auto-detect the old or new ABI.
[hch: move xlog_grant_sub_space out of line, update the xlog_grant_{add,sub}_space prototypes, rename the sysfs files to allow auto-detection in xfstests]
Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Darrick J. Wong <djwong@kernel.org> Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Dave Chinner <dchinner@redhat.com> Signed-off-by: Chandan Babu R <chandanbabu@kernel.org>
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