e2fsprogs: Add a patch to speedup mkfs
See the patch description, this adds a tweak to an algorithm to improve core-image-sato-sdk mkfs time from over 8 minutes to about 35s. Needs discussion upstream but seems reasonable for our uses of it. (From OE-Core rev: 468fa9a7fac86bb0fcd3cbd18dc1492b57ca25f3) Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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@ -0,0 +1,52 @@
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The comment to this function says:
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"""
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* Stupid algorithm --- we now just search forward starting from the
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* goal. Should put in a smarter one someday....
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"""
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This adds in a rather hacky algorthim which starts where we finished
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searching previously using a static variable rather than starting
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from scratch if a hint isn't provided.
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This was after noticing that mkfs.ext4 -F X -d Y was spending *lots*
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of time in ext2fs_new_block2 called from ext2fs_bmap from ext2fs_file_write().
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Numbers wise, this took a core-image-sato-sdk mkfs time from over
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8 minutes to around 35 seconds.
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Upstream-Status: Pending
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RP 2015/02/20
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Index: e2fsprogs-1.42.9/lib/ext2fs/alloc.c
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===================================================================
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--- e2fsprogs-1.42.9.orig/lib/ext2fs/alloc.c
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+++ e2fsprogs-1.42.9/lib/ext2fs/alloc.c
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@@ -160,6 +160,8 @@ errcode_t ext2fs_new_inode(ext2_filsys f
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return 0;
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}
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+static blk64_t last_goal = 0;
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+
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/*
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* Stupid algorithm --- we now just search forward starting from the
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* goal. Should put in a smarter one someday....
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@@ -170,6 +172,9 @@ errcode_t ext2fs_new_block2(ext2_filsys
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blk64_t i;
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int c_ratio;
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+ if (!goal)
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+ goal = last_goal;
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+
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EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
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if (!map)
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@@ -194,6 +199,7 @@ errcode_t ext2fs_new_block2(ext2_filsys
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if (!ext2fs_fast_test_block_bitmap2(map, i)) {
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*ret = i;
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+ last_goal = i;
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return 0;
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}
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i = (i + c_ratio) & ~(c_ratio - 1);
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@ -19,6 +19,7 @@ SRC_URI += "file://acinclude.m4 \
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file://0012-Fix-musl-build-failures.patch \
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file://0001-e2fsprogs-fix-cross-compilation-problem.patch \
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file://misc-mke2fs.c-return-error-when-failed-to-populate-fs.patch \
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file://cache_inode.patch \
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"
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SRC_URI[md5sum] = "3f8e41e63b432ba114b33f58674563f7"
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