kernel/linux
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ synced 2026-11-10 20:48:12 +00:00
Code Issues Releases Packages Activity

soundwire: optimize sdw_stream_runtime memory layout

Browse source 
pahole suggestion: swap position of 'm_rt_count'

before: pahole -C sdw_stream_runtime drivers/soundwire/soundwire-bus.ko
struct sdw_stream_runtime {
	const char  *              name;                 /*     0     8 */
	struct sdw_stream_params   params;               /*     8    12 */
	enum sdw_stream_state      state;                /*    20     4 */
	enum sdw_stream_type       type;                 /*    24     4 */

	/* XXX 4 bytes hole, try to pack */

	struct list_head           master_list;          /*    32    16 */
	int                        m_rt_count;           /*    48     4 */

	/* size: 56, cachelines: 1, members: 6 */
	/* sum members: 48, holes: 1, sum holes: 4 */
	/* padding: 4 */
	/* last cacheline: 56 bytes */
};

after: pahole --reorganize -C sdw_stream_runtime drivers/soundwire/soundwire-bus.ko
struct sdw_stream_runtime {
	const char  *              name;                 /*     0     8 */
	struct sdw_stream_params   params;               /*     8    12 */
	enum sdw_stream_state      state;                /*    20     4 */
	enum sdw_stream_type       type;                 /*    24     4 */
	int                        m_rt_count;           /*    28     4 */
	struct list_head           master_list;          /*    32    16 */

	/* size: 48, cachelines: 1, members: 6 */
	/* last cacheline: 48 bytes */
};   /* saved 8 bytes! */

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20241003070650.62787-3-yung-chuan.liao@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Pierre-Louis Bossart 2024-10-03 15:06:38 +08:00 • committed by Vinod Koul
commit 444d6824a4
1 changed files with 5 additions and 5 deletions
Download patch file Download diff file Expand all files Collapse all files