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    Subject[PATCH 25/38] tools lib traceevent: Add kmem plugin
    Date
    From: Jiri Olsa <jolsa@redhat.com>

    Backporting kmem plugin.

    Backported from Steven Rostedt's trace-cmd repo (HEAD 0f2c2fb):
    git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/trace-cmd.git

    This plugin adds call_site field resolving for following tracepoint
    events:

    kmem:kfree
    kmem:kmalloc
    kmem:kmalloc_node
    kmem:kmem_cache_alloc
    kmem:kmem_cache_alloc_node
    kmem:kmem_cache_free

    The diff of 'perf script' output generated by old and new code: (data
    was generated by 'perf record -e 'kmem:*' -a')

    --- script.kmem.old
    +++ script.kmem.new
    - perf 27846 [001] 29643.403319: kmem:kfree: call_site=ffffffff810e64f6 ptr=(nil)
    + perf 27846 [001] 29643.403238: kmem:kfree: (__audit_syscall_exit+0x1f6) call_site=ffffffff810e64f6 ptr=(nil)
    - perf 27846 [001] 29643.403337: kmem:kmem_cache_alloc: call_site=ffffffff812ff0c5 ptr=0xffff88020e155630 bytes_req=560 bytes_alloc=568 gfp_flags=GFP_KERNEL
    + perf 27846 [001] 29643.403337: kmem:kmem_cache_alloc: (radix_tree_preload+0x35) call_site=ffffffff812ff0c5 ptr=0xffff88020e155630 bytes_req=560 bytes_alloc=568 gfp_flags=GFP_KERNEL
    - perf 27846 [001] 29643.403342: kmem:kmem_cache_free: call_site=ffffffff8126ec61 ptr=0xffff88020dffe750
    + perf 27846 [001] 29643.403342: kmem:kmem_cache_free: (jbd2_journal_stop+0x221) call_site=ffffffff8126ec61 ptr=0xffff88020dffe750
    - firefox 954 [000] 29643.445477: kmem:kmem_cache_alloc_node: call_site=ffffffff8153c64e ptr=0xffff8801cecb4000 bytes_req=256 bytes_alloc=256 gfp_flags=GFP_KERNEL|GFP_REPEAT node=-1
    + firefox 954 [000] 29643.445477: kmem:kmem_cache_alloc_node: (__alloc_skb+0x4e) call_site=ffffffff8153c64e ptr=0xffff8801cecb4000 bytes_req=256 bytes_alloc=256 gfp_flags=GFP_KERNEL|GFP_REPEAT node=-1
    - perf 27846 [001] 29643.445510: kmem:kmalloc: call_site=ffffffff81250642 ptr=0xffff88020fd6c300 bytes_req=96 bytes_alloc=96 gfp_flags=GFP_NOFS|GFP_ZERO
    + perf 27846 [001] 29643.445510: kmem:kmalloc: (ext4_ext_find_extent+0x362) call_site=ffffffff81250642 ptr=0xffff88020fd6c300 bytes_req=96 bytes_alloc=96 gfp_flags=GFP_NOFS|GFP_ZERO
    - X 888 [002] 29643.445546: kmem:kmalloc_node: call_site=ffffffff8153c67e ptr=0xffff880103828e00 bytes_req=384 bytes_alloc=512 gfp_flags=GFP_KERNEL|GFP_NOWARN|GFP_REPEAT|GFP_NOMEMALLOC node=-1
    + X 888 [002] 29643.445546: kmem:kmalloc_node: (__alloc_skb+0x7e) call_site=ffffffff8153c67e ptr=0xffff880103828e00 bytes_req=384 bytes_alloc=512 gfp_flags=GFP_KERNEL|GFP_NOWARN|GFP_REPEAT|GFP_NOMEMALLOC node=-1

    Signed-off-by: Jiri Olsa <jolsa@redhat.com>
    Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
    Cc: David Ahern <dsahern@gmail.com>
    Cc: Frederic Weisbecker <fweisbec@gmail.com>
    Cc: Ingo Molnar <mingo@elte.hu>
    Cc: Namhyung Kim <namhyung@kernel.org>
    Cc: Paul Mackerras <paulus@samba.org>
    Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
    Cc: Steven Rostedt <rostedt@goodmis.org>
    Link: http://lkml.kernel.org/r/1386076182-14484-15-git-send-email-jolsa@redhat.com
    Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
    Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
    ---
    tools/lib/traceevent/Makefile | 1 +
    tools/lib/traceevent/plugin_kmem.c | 72 ++++++++++++++++++++++++++++++++++++++
    2 files changed, 73 insertions(+)
    create mode 100644 tools/lib/traceevent/plugin_kmem.c

    diff --git a/tools/lib/traceevent/Makefile b/tools/lib/traceevent/Makefile
    index 9ff2e2596614..245d6b4f0aed 100644
    --- a/tools/lib/traceevent/Makefile
    +++ b/tools/lib/traceevent/Makefile
    @@ -214,6 +214,7 @@ PEVENT_LIB_OBJS += kbuffer-parse.o

    PLUGIN_OBJS = plugin_jbd2.o
    PLUGIN_OBJS += plugin_hrtimer.o
    +PLUGIN_OBJS += plugin_kmem.o

    PLUGINS := $(PLUGIN_OBJS:.o=.so)

    diff --git a/tools/lib/traceevent/plugin_kmem.c b/tools/lib/traceevent/plugin_kmem.c
    new file mode 100644
    index 000000000000..7115c8037ea8
    --- /dev/null
    +++ b/tools/lib/traceevent/plugin_kmem.c
    @@ -0,0 +1,72 @@
    +/*
    + * Copyright (C) 2009 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
    + *
    + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + * This program is free software; you can redistribute it and/or
    + * modify it under the terms of the GNU Lesser General Public
    + * License as published by the Free Software Foundation;
    + * version 2.1 of the License (not later!)
    + *
    + * This program is distributed in the hope that it will be useful,
    + * but WITHOUT ANY WARRANTY; without even the implied warranty of
    + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    + * GNU Lesser General Public License for more details.
    + *
    + * You should have received a copy of the GNU Lesser General Public
    + * License along with this program; if not, see <http://www.gnu.org/licenses>
    + *
    + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + */
    +#include <stdio.h>
    +#include <stdlib.h>
    +#include <string.h>
    +
    +#include "event-parse.h"
    +
    +static int call_site_handler(struct trace_seq *s, struct pevent_record *record,
    + struct event_format *event, void *context)
    +{
    + struct format_field *field;
    + unsigned long long val, addr;
    + void *data = record->data;
    + const char *func;
    +
    + field = pevent_find_field(event, "call_site");
    + if (!field)
    + return 1;
    +
    + if (pevent_read_number_field(field, data, &val))
    + return 1;
    +
    + func = pevent_find_function(event->pevent, val);
    + if (!func)
    + return 1;
    +
    + addr = pevent_find_function_address(event->pevent, val);
    +
    + trace_seq_printf(s, "(%s+0x%x) ", func, (int)(val - addr));
    + return 1;
    +}
    +
    +int PEVENT_PLUGIN_LOADER(struct pevent *pevent)
    +{
    + pevent_register_event_handler(pevent, -1, "kmem", "kfree",
    + call_site_handler, NULL);
    +
    + pevent_register_event_handler(pevent, -1, "kmem", "kmalloc",
    + call_site_handler, NULL);
    +
    + pevent_register_event_handler(pevent, -1, "kmem", "kmalloc_node",
    + call_site_handler, NULL);
    +
    + pevent_register_event_handler(pevent, -1, "kmem", "kmem_cache_alloc",
    + call_site_handler, NULL);
    +
    + pevent_register_event_handler(pevent, -1, "kmem",
    + "kmem_cache_alloc_node",
    + call_site_handler, NULL);
    +
    + pevent_register_event_handler(pevent, -1, "kmem", "kmem_cache_free",
    + call_site_handler, NULL);
    + return 0;
    +}
    --
    1.8.1.4


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