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author | Jim Cromie <jim.cromie@gmail.com> | 2022-11-17 20:16:33 +0300 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-11-17 21:37:04 +0300 |
commit | 1d926e259d8f8195fdfaeea7951149001894b473 (patch) | |
tree | 5740bb8fdb511b85b69ad8ba3c0261f64d198369 /drivers/net/wwan/iosm/iosm_ipc_coredump.c | |
parent | 435d6b6564568b82ec74ee7d4d0bcb1f24ccb5f5 (diff) | |
download | linux-1d926e259d8f8195fdfaeea7951149001894b473.tar.xz |
vmlinux.lds.h: add HEADERED_SECTION_* macros
These macros elaborate on BOUNDED_SECTION_(PRE|POST)_LABEL macros,
prepending an optional KEEP(.gnu.linkonce##_sec_) reservation, and a
linker-symbol to address it.
This allows a developer to define a header struct (which must fit with
the section's base struct-type), and could contain:
1- fields whose value is common to the entire set of data-records.
This allows the header & data structs to specialize, complement
each other, and shrink.
2- an uplink pointer to an organizing struct
which refs other related/sub data-tables
header record is addressable via the extern'd header linker-symbol
Once the linker-symbols created by the macro are ref'd extern in code,
that code can compute a record's index (ptr - start) in the "primary"
table, then use it to index into the related/sub tables. Adding a
primary.map_* field foreach sub-table would then allow deduplication
and remapping of that sub-table.
This is aimed at dyndbg's struct _ddebug __dyndbg[] section, whose 3
columns: function, file, module are 50%, 90%, 100% redundant. The
module column is fully recoverable after dynamic_debug_init() saves it
to each ddebug_table.module as the builtin __dyndbg[] table is parsed.
Given that those 3 columns use 24/56 of a _ddebug record, a dyndbg=y
kernel with ~5k callsites could reduce kernel memory substantially.
Returning that memory to the kernel buddy-allocator? is then possible.
Signed-off-by: Jim Cromie <jim.cromie@gmail.com>
Link: https://lore.kernel.org/r/20221117171633.923628-3-jim.cromie@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/net/wwan/iosm/iosm_ipc_coredump.c')
0 files changed, 0 insertions, 0 deletions