cregit-Linux how code gets into the kernel

Release 4.11 tools/perf/util/comm.c

Directory: tools/perf/util
#include "comm.h"
#include "util.h"
#include <stdlib.h>
#include <stdio.h>
#include <linux/atomic.h>


struct comm_str {
	
char *str;
	
struct rb_node rb_node;
	
atomic_t refcnt;
};

/* Should perhaps be moved to struct machine */

static struct rb_root comm_str_root;


static struct comm_str *comm_str__get(struct comm_str *cs) { if (cs) atomic_inc(&cs->refcnt); return cs; }

Contributors

PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo1553.57%150.00%
Frédéric Weisbecker1346.43%150.00%
Total28100.00%2100.00%


static void comm_str__put(struct comm_str *cs) { if (cs && atomic_dec_and_test(&cs->refcnt)) { rb_erase(&cs->rb_node, &comm_str_root); zfree(&cs->str); free(cs); } }

Contributors

PersonTokensPropCommitsCommitProp
Frédéric Weisbecker4081.63%133.33%
Arnaldo Carvalho de Melo918.37%266.67%
Total49100.00%3100.00%


static struct comm_str *comm_str__alloc(const char *str) { struct comm_str *cs; cs = zalloc(sizeof(*cs)); if (!cs) return NULL; cs->str = strdup(str); if (!cs->str) { free(cs); return NULL; } atomic_set(&cs->refcnt, 0); return cs; }

Contributors

PersonTokensPropCommitsCommitProp
Frédéric Weisbecker6686.84%150.00%
Arnaldo Carvalho de Melo1013.16%150.00%
Total76100.00%2100.00%


static struct comm_str *comm_str__findnew(const char *str, struct rb_root *root) { struct rb_node **p = &root->rb_node; struct rb_node *parent = NULL; struct comm_str *iter, *new; int cmp; while (*p != NULL) { parent = *p; iter = rb_entry(parent, struct comm_str, rb_node); cmp = strcmp(str, iter->str); if (!cmp) return iter; if (cmp < 0) p = &(*p)->rb_left; else p = &(*p)->rb_right; } new = comm_str__alloc(str); if (!new) return NULL; rb_link_node(&new->rb_node, parent, p); rb_insert_color(&new->rb_node, root); return new; }

Contributors

PersonTokensPropCommitsCommitProp
Frédéric Weisbecker159100.00%1100.00%
Total159100.00%1100.00%


struct comm *comm__new(const char *str, u64 timestamp, bool exec) { struct comm *comm = zalloc(sizeof(*comm)); if (!comm) return NULL; comm->start = timestamp; comm->exec = exec; comm->comm_str = comm_str__findnew(str, &comm_str_root); if (!comm->comm_str) { free(comm); return NULL; } comm_str__get(comm->comm_str); return comm; }

Contributors

PersonTokensPropCommitsCommitProp
Frédéric Weisbecker8290.11%150.00%
Adrian Hunter99.89%150.00%
Total91100.00%2100.00%


int comm__override(struct comm *comm, const char *str, u64 timestamp, bool exec) { struct comm_str *new, *old = comm->comm_str; new = comm_str__findnew(str, &comm_str_root); if (!new) return -ENOMEM; comm_str__get(new); comm_str__put(old); comm->comm_str = new; comm->start = timestamp; if (exec) comm->exec = true; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Namhyung Kim5057.47%133.33%
Frédéric Weisbecker2427.59%133.33%
Adrian Hunter1314.94%133.33%
Total87100.00%3100.00%


void comm__free(struct comm *comm) { comm_str__put(comm->comm_str); free(comm); }

Contributors

PersonTokensPropCommitsCommitProp
Frédéric Weisbecker22100.00%1100.00%
Total22100.00%1100.00%


const char *comm__str(const struct comm *comm) { return comm->comm_str->str; }

Contributors

PersonTokensPropCommitsCommitProp
Frédéric Weisbecker20100.00%1100.00%
Total20100.00%1100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Frédéric Weisbecker45880.49%233.33%
Namhyung Kim508.79%116.67%
Arnaldo Carvalho de Melo396.85%233.33%
Adrian Hunter223.87%116.67%
Total569100.00%6100.00%
Directory: tools/perf/util
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