trace: reorder perf_event_context to remove alignment padding on 64 bit builds
PATCH 1/1 trace: reorder perf_event_context to remove alignment padding on 64 bit builds
Remove 8 bytes of alignment padding from perf_event_context on 64 bit builds which shrinks its size to 192 bytes allowing it to fit into one fewer cache lines and into a smaller slab.
---
patch against v2.6.38-rc7
compiled and tested on x86_64
regards
Richard
include/linux/perf_event.h +1 -1
@@ -846,8 +846,8 @@ enum perf_event_context_type {* Used as a container for task events and CPU events as well: */ struct perf_event_context { -enum perf_event_context_type type;struct pmu *pmu; +enum perf_event_context_type type;/* * Protect the states of the events in the list, * nr_active, and the list:
[tip:perf/urgent] perf: Reorder & optimize perf_event_context to remove alignment padding on 64 bit builds
Commit-ID: ee643c4179c3a18b018de3a4c07a7bb3a75c8e4e Gitweb: http://git.kernel.org/tip/ee643c4179c3a18b018de3a4c07a7bb3a75c8e4e Author: Richard Kennedy <[email protected]> AuthorDate: Mon, 7 Mar 2011 15:46:59 +0000 Committer: Ingo Molnar <[email protected]> CommitDate: Wed, 16 Mar 2011 14:04:14 +0100
perf: Reorder & optimize perf_event_context to remove alignment padding on 64 bit builds
Remove 8 bytes of alignment padding from perf_event_context on 64 bit builds which shrinks its size to 192 bytes allowing it to fit into one fewer cache lines and into a smaller slab.
LKML-Reference: <[email protected]>
--- include/linux/perf_event.h | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-)
include/linux/perf_event.h +1 -1
@@ -878,8 +878,8 @@ enum perf_event_context_type {* Used as a container for task events and CPU events as well: */ struct perf_event_context { -enum perf_event_context_type type;struct pmu *pmu; +enum perf_event_context_type type;/* * Protect the states of the events in the list, * nr_active, and the list: