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    Subject[tip:perf/core] perf hists browser: Support flat callchains
    Commit-ID:  4b3a3212233a042f48b7b8fedc64933e1ccd8643
    Gitweb: http://git.kernel.org/tip/4b3a3212233a042f48b7b8fedc64933e1ccd8643
    Author: Namhyung Kim <namhyung@kernel.org>
    AuthorDate: Mon, 9 Nov 2015 14:45:43 +0900
    Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
    CommitDate: Thu, 19 Nov 2015 13:19:24 -0300

    perf hists browser: Support flat callchains

    The flat callchain mode is to print all chains in a single, simple
    hierarchy so make it easy to see.

    Currently perf report --tui doesn't show flat callchains properly. With
    flat callchains, only leaf nodes are added to the final rbtree so it
    should show entries in parent nodes. To do that, add parent_val list to
    struct callchain_node and show them along with the (normal) val list.

    For example, consider following callchains with '-g graph'.

    $ perf report -g graph
    - 39.93% swapper [kernel.vmlinux] [k] intel_idle
    intel_idle
    cpuidle_enter_state
    cpuidle_enter
    call_cpuidle
    - cpu_startup_entry
    28.63% start_secondary
    - 11.30% rest_init
    start_kernel
    x86_64_start_reservations
    x86_64_start_kernel

    Before:
    $ perf report -g flat
    - 39.93% swapper [kernel.vmlinux] [k] intel_idle
    28.63% start_secondary
    - 11.30% rest_init
    start_kernel
    x86_64_start_reservations
    x86_64_start_kernel

    After:
    $ perf report -g flat
    - 39.93% swapper [kernel.vmlinux] [k] intel_idle
    - 28.63% intel_idle
    cpuidle_enter_state
    cpuidle_enter
    call_cpuidle
    cpu_startup_entry
    start_secondary
    - 11.30% intel_idle
    cpuidle_enter_state
    cpuidle_enter
    call_cpuidle
    cpu_startup_entry
    start_kernel
    x86_64_start_reservations
    x86_64_start_kernel

    Signed-off-by: Namhyung Kim <namhyung@kernel.org>
    Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
    Tested-by: Brendan Gregg <brendan.d.gregg@gmail.com>
    Cc: Andi Kleen <andi@firstfloor.org>
    Cc: David Ahern <dsahern@gmail.com>
    Cc: Frederic Weisbecker <fweisbec@gmail.com>
    Cc: Jiri Olsa <jolsa@redhat.com>
    Cc: Kan Liang <kan.liang@intel.com>
    Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
    Link: http://lkml.kernel.org/r/1447047946-1691-8-git-send-email-namhyung@kernel.org
    Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
    ---
    tools/perf/ui/browsers/hists.c | 122 ++++++++++++++++++++++++++++++++++++++++-
    tools/perf/util/callchain.c | 44 +++++++++++++++
    tools/perf/util/callchain.h | 2 +
    3 files changed, 166 insertions(+), 2 deletions(-)

    diff --git a/tools/perf/ui/browsers/hists.c b/tools/perf/ui/browsers/hists.c
    index 0746d41..c44af46 100644
    --- a/tools/perf/ui/browsers/hists.c
    +++ b/tools/perf/ui/browsers/hists.c
    @@ -178,12 +178,44 @@ static int callchain_node__count_rows_rb_tree(struct callchain_node *node)
    return n;
    }

    +static int callchain_node__count_flat_rows(struct callchain_node *node)
    +{
    + struct callchain_list *chain;
    + char folded_sign = 0;
    + int n = 0;
    +
    + list_for_each_entry(chain, &node->parent_val, list) {
    + if (!folded_sign) {
    + /* only check first chain list entry */
    + folded_sign = callchain_list__folded(chain);
    + if (folded_sign == '+')
    + return 1;
    + }
    + n++;
    + }
    +
    + list_for_each_entry(chain, &node->val, list) {
    + if (!folded_sign) {
    + /* node->parent_val list might be empty */
    + folded_sign = callchain_list__folded(chain);
    + if (folded_sign == '+')
    + return 1;
    + }
    + n++;
    + }
    +
    + return n;
    +}
    +
    static int callchain_node__count_rows(struct callchain_node *node)
    {
    struct callchain_list *chain;
    bool unfolded = false;
    int n = 0;

    + if (callchain_param.mode == CHAIN_FLAT)
    + return callchain_node__count_flat_rows(node);
    +
    list_for_each_entry(chain, &node->val, list) {
    ++n;
    unfolded = chain->unfolded;
    @@ -263,7 +295,7 @@ static void callchain_node__init_have_children(struct callchain_node *node,
    chain = list_entry(node->val.next, struct callchain_list, list);
    chain->has_children = has_sibling;

    - if (!list_empty(&node->val)) {
    + if (node->val.next != node->val.prev) {
    chain = list_entry(node->val.prev, struct callchain_list, list);
    chain->has_children = !RB_EMPTY_ROOT(&node->rb_root);
    }
    @@ -279,6 +311,8 @@ static void callchain__init_have_children(struct rb_root *root)
    for (nd = rb_first(root); nd; nd = rb_next(nd)) {
    struct callchain_node *node = rb_entry(nd, struct callchain_node, rb_node);
    callchain_node__init_have_children(node, has_sibling);
    + if (callchain_param.mode == CHAIN_FLAT)
    + callchain_node__make_parent_list(node);
    }
    }

    @@ -612,6 +646,83 @@ static int hist_browser__show_callchain_list(struct hist_browser *browser,
    return 1;
    }

    +static int hist_browser__show_callchain_flat(struct hist_browser *browser,
    + struct rb_root *root,
    + unsigned short row, u64 total,
    + print_callchain_entry_fn print,
    + struct callchain_print_arg *arg,
    + check_output_full_fn is_output_full)
    +{
    + struct rb_node *node;
    + int first_row = row, offset = LEVEL_OFFSET_STEP;
    + bool need_percent;
    +
    + node = rb_first(root);
    + need_percent = node && rb_next(node);
    +
    + while (node) {
    + struct callchain_node *child = rb_entry(node, struct callchain_node, rb_node);
    + struct rb_node *next = rb_next(node);
    + struct callchain_list *chain;
    + char folded_sign = ' ';
    + int first = true;
    + int extra_offset = 0;
    +
    + list_for_each_entry(chain, &child->parent_val, list) {
    + bool was_first = first;
    +
    + if (first)
    + first = false;
    + else if (need_percent)
    + extra_offset = LEVEL_OFFSET_STEP;
    +
    + folded_sign = callchain_list__folded(chain);
    +
    + row += hist_browser__show_callchain_list(browser, child,
    + chain, row, total,
    + was_first && need_percent,
    + offset + extra_offset,
    + print, arg);
    +
    + if (is_output_full(browser, row))
    + goto out;
    +
    + if (folded_sign == '+')
    + goto next;
    + }
    +
    + list_for_each_entry(chain, &child->val, list) {
    + bool was_first = first;
    +
    + if (first)
    + first = false;
    + else if (need_percent)
    + extra_offset = LEVEL_OFFSET_STEP;
    +
    + folded_sign = callchain_list__folded(chain);
    +
    + row += hist_browser__show_callchain_list(browser, child,
    + chain, row, total,
    + was_first && need_percent,
    + offset + extra_offset,
    + print, arg);
    +
    + if (is_output_full(browser, row))
    + goto out;
    +
    + if (folded_sign == '+')
    + break;
    + }
    +
    +next:
    + if (is_output_full(browser, row))
    + break;
    + node = next;
    + }
    +out:
    + return row - first_row;
    +}
    +
    static int hist_browser__show_callchain(struct hist_browser *browser,
    struct rb_root *root, int level,
    unsigned short row, u64 total,
    @@ -864,10 +975,17 @@ static int hist_browser__show_entry(struct hist_browser *browser,
    total = entry->stat.period;
    }

    - printed += hist_browser__show_callchain(browser,
    + if (callchain_param.mode == CHAIN_FLAT) {
    + printed += hist_browser__show_callchain_flat(browser,
    + &entry->sorted_chain, row, total,
    + hist_browser__show_callchain_entry, &arg,
    + hist_browser__check_output_full);
    + } else {
    + printed += hist_browser__show_callchain(browser,
    &entry->sorted_chain, 1, row, total,
    hist_browser__show_callchain_entry, &arg,
    hist_browser__check_output_full);
    + }

    if (arg.is_current_entry)
    browser->he_selection = entry;
    diff --git a/tools/perf/util/callchain.c b/tools/perf/util/callchain.c
    index 717c58c..fc3b1e0 100644
    --- a/tools/perf/util/callchain.c
    +++ b/tools/perf/util/callchain.c
    @@ -387,6 +387,7 @@ create_child(struct callchain_node *parent, bool inherit_children)
    }
    new->parent = parent;
    INIT_LIST_HEAD(&new->val);
    + INIT_LIST_HEAD(&new->parent_val);

    if (inherit_children) {
    struct rb_node *n;
    @@ -894,6 +895,11 @@ static void free_callchain_node(struct callchain_node *node)
    struct callchain_node *child;
    struct rb_node *n;

    + list_for_each_entry_safe(list, tmp, &node->parent_val, list) {
    + list_del(&list->list);
    + free(list);
    + }
    +
    list_for_each_entry_safe(list, tmp, &node->val, list) {
    list_del(&list->list);
    free(list);
    @@ -917,3 +923,41 @@ void free_callchain(struct callchain_root *root)

    free_callchain_node(&root->node);
    }
    +
    +int callchain_node__make_parent_list(struct callchain_node *node)
    +{
    + struct callchain_node *parent = node->parent;
    + struct callchain_list *chain, *new;
    + LIST_HEAD(head);
    +
    + while (parent) {
    + list_for_each_entry_reverse(chain, &parent->val, list) {
    + new = malloc(sizeof(*new));
    + if (new == NULL)
    + goto out;
    + *new = *chain;
    + new->has_children = false;
    + list_add_tail(&new->list, &head);
    + }
    + parent = parent->parent;
    + }
    +
    + list_for_each_entry_safe_reverse(chain, new, &head, list)
    + list_move_tail(&chain->list, &node->parent_val);
    +
    + if (!list_empty(&node->parent_val)) {
    + chain = list_first_entry(&node->parent_val, struct callchain_list, list);
    + chain->has_children = rb_prev(&node->rb_node) || rb_next(&node->rb_node);
    +
    + chain = list_first_entry(&node->val, struct callchain_list, list);
    + chain->has_children = false;
    + }
    + return 0;
    +
    +out:
    + list_for_each_entry_safe(chain, new, &head, list) {
    + list_del(&chain->list);
    + free(chain);
    + }
    + return -ENOMEM;
    +}
    diff --git a/tools/perf/util/callchain.h b/tools/perf/util/callchain.h
    index 47bc0c5..6e9b5f2 100644
    --- a/tools/perf/util/callchain.h
    +++ b/tools/perf/util/callchain.h
    @@ -56,6 +56,7 @@ enum chain_order {
    struct callchain_node {
    struct callchain_node *parent;
    struct list_head val;
    + struct list_head parent_val;
    struct rb_node rb_node_in; /* to insert nodes in an rbtree */
    struct rb_node rb_node; /* to sort nodes in an output tree */
    struct rb_root rb_root_in; /* input tree of children */
    @@ -251,5 +252,6 @@ int callchain_node__fprintf_value(struct callchain_node *node,
    FILE *fp, u64 total);

    void free_callchain(struct callchain_root *root);
    +int callchain_node__make_parent_list(struct callchain_node *node);

    #endif /* __PERF_CALLCHAIN_H */

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