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commit 5eda2dbdb1a3eaae70178df55b7e3d7508b15c9b
Author: Milos Nikic <[email protected]>
Date: Mon Aug 25 21:38:08 2025 +0100
libpager, ext2fs: add bulk page write support
Introduce a new pager_write_pages() entry point, allowing filesystems
to implement multi-page writes in one call. libpager will attempt to
coalesce contiguous dirty pages and call this bulk interface; if it is
unsupported or only partially completes, the remaining pages are
handled by the existing per-page path.
ext2fs now provides file_pager_write_pages(), implemented using a
small chunked write loop (currently 2 blocks per chunk) under
alloc_lock. This reduces lock/unlock cycles, improves batching of
store_write() calls, and avoids starvation by yielding between chunks.
Other filesystems may continue using pager_write_page() unchanged.
Test write 128 MiB dirty file:
Before this change:
store_write calls: 32,874; avg: 4,096 B
After this change (coalesced runs, cap=128):
store_write calls: 1,300; avg 103 KiB
(~25 times fewer calls, ~25 times larger writes)
-----------------------------------------------------------------------
Summary of changes:
doc/hurd.texi | 8 ++
ext2fs/pager.c | 147 ++++++++++++++++++++++
libpager/Makefile | 2 +-
libpager/data-return.c | 53 ++++++--
libtrivfs/io-modes-off.c => libpager/pager-bulk.c | 31 ++---
libpager/pager.h | 10 ++
6 files changed, 229 insertions(+), 22 deletions(-)
copy libtrivfs/io-modes-off.c => libpager/pager-bulk.c (52%)
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